Jürgen Haase

Leipzig University

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Leipzig University

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University of Illinois Urbana-Champaign

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Jürgen Haase has a total of 118 co-authors. Here are the top co-authors by number of shared publications:

Dieter Freude
Faculty of Physics and Earth Sciences, Leipzig University, Linnéstraße 5, 04103 Leipzig, Germany
12 shared publications
Alexander Grigorievich Stepanov
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia
8 shared publications
Sergei S. Arzumanov
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia
8 shared publications
Anton A. Gabrienko
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia
7 shared publications
Jörg Kärger
Leipzig University, Faculty of Physics and Earth System Sciences, Linnéstr. 5, Leipzig 04103, Germany
6 shared publications
Michael Jurkutat
Felix Bloch Institute for Solid State Physics, Leipzig University 1 , Linnéstraße 5, 04103 Leipzig, Germany
6 shared publications

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Cited by 1
- 20 August 2026
- Published by MDPI AG in Condensed Matter
Hidden Universal Metal in Cuprate Superconductors
by Abigail Lee, Jürgen Haase
Nuclear relaxation, $1 / T_{1}$ , is a very robust probe of electronic excitations in superconducting materials above and below the critical temperature of superconductivity, $T_{c}$ . Here, a relaxation phenomenology of hole-doped cuprate superconductors is presented based on the majority of the available literature data from the CuO₂ plane, without assumptions with respect to a hyperfine scenario, form factors, or particular theoretical models. Below a temperature similar to the pseudogap temperature, Heitler–Teller-type relaxation is uncovered universally; i.e., the nuclear spin relaxation above $T_{c}$ is only determined by the absolute temperature, $1 / T_{1} \propto T$ . All materials condense out of this metal at $T_{c}$ , below which relaxation drops even faster, as expected from conventional superconductors, albeit without a Hebel–Slichter peak. It is a ’hidden metal’ in the sense that it has a vanishing uniform response and thus hardly affects the NMR shifts; it is also not seen in planar O relaxation. The hidden metal causes a temperature-independent but material-dependent planar Cu relaxation anisotropy that is strongly correlated with the size of $T_{c}$ . Moreover, the rate measured with the field in the CuO₂ plane is nearly the same for all cuprates: $1 / {{}^{63}T}_{1 ⊥} T \approx 25 /$ Ks, where $1 / {{}^{63}T}_{1 ‖}$ is mainly responsible for the change in anisotropy. Above the hidden metal, the relaxation behavior changes and can be described by an ordinary but renormalized metal, with a reduced Cu relaxation anisotropy. The relaxation phenomenology, which should hold clues to the so-called strange metal, is also discussed in the context of the two spin components previously uncovered in the shifts, as well as the pseudogap and relation to other probes. This new phenomenology should give a better foundation for the understanding of the cuprates.
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- 20 August 2026
- Published by MDPI AG in Condensed Matter
Open Access
Hidden Universal Metal in Cuprate Superconductors
by Abigail Lee, Jürgen Haase
Nuclear relaxation, $1 / T_{1}$ , is a very robust probe of electronic excitations in superconducting materials above and below the critical temperature of superconductivity, $T_{c}$ . Here, a relaxation phenomenology of hole-doped cuprate superconductors is presented based on the majority of the available literature data from the CuO₂ plane, without assumptions with respect to a hyperfine scenario, form factors, or particular theoretical models. Below a temperature similar to the pseudogap temperature, Heitler–Teller-type relaxation is uncovered universally; i.e., the nuclear spin relaxation above $T_{c}$ is only determined by the absolute temperature, $1 / T_{1} \propto T$ . All materials condense out of this metal at $T_{c}$ , below which relaxation drops even faster, as expected from conventional superconductors, albeit without a Hebel–Slichter peak. It is a ’hidden metal’ in the sense that it has a vanishing uniform response and thus hardly affects the NMR shifts; it is also not seen in planar O relaxation. The hidden metal causes a temperature-independent but material-dependent planar Cu relaxation anisotropy that is strongly correlated with the size of $T_{c}$ . Moreover, the rate measured with the field in the CuO₂ plane is nearly the same for all cuprates: $1 / {{}^{63}T}_{1 ⊥} T \approx 25 /$ Ks, where $1 / {{}^{63}T}_{1 ‖}$ is mainly responsible for the change in anisotropy. Above the hidden metal, the relaxation behavior changes and can be described by an ordinary but renormalized metal, with a reduced Cu relaxation anisotropy. The relaxation phenomenology, which should hold clues to the so-called strange metal, is also discussed in the context of the two spin components previously uncovered in the shifts, as well as the pseudogap and relation to other probes. This new phenomenology should give a better foundation for the understanding of the cuprates.
Cited by 1
Open Access
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- 16 May 2026
- Published by MDPI AG in Condensed Matter
Pseudogap and Condensation in Cuprate Superconductors from NMR Shifts
by Abigail Lee, Jürgen Haase
The electronic properties of high-temperature superconducting cuprates are encoded in NMR data. Without microscopic theory, reliable NMR phenomenologies are in demand. Here we make use of the extensive literature data to develop a different understanding of the cuprates from the shifts of the ${CuO}_{2}$ plane. The Cu shift analysis is based only on the symmetry of the two Cu hyperfine couplings, without assumptions about their size. We use an anisotropic $A_{α}$ and isotropic B, as from atomic Cu orbitals, and find two spin components (A- and B-spins) that explain all the shift data. The components differ in size and temperature dependence according to simple rules. Upon doping the cuprates, metallic B-spin appears above a pseudogap temperature, which is shared with the A-spin. Further doping decreases the pseudogap temperature and increases the B-spin, but less so the A-spin. The apparent linear rate of increase in the density of states of the B-spin with doping is nearly threefold above $x = 0.20$ , where the pseudogap disappears. The pseudogap temperature is a measure of the coupling between A and B, which suppresses the shifts but not nuclear relaxation. Spin-singlet pairing involves A and B according to three simple condensation rates, which will be discussed. The optimal $T_{c}$ demands a special match between A and B. However, the shifts do not simply predict the highest $T_{c}$ of all cuprates, in contrast to nuclear relaxation anisotropy and charge sharing between planar Cu and O. Relations to other probes are discussed.
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- 16 May 2026
- Published by MDPI AG in Condensed Matter
Open Access
Pseudogap and Condensation in Cuprate Superconductors from NMR Shifts
by Abigail Lee, Jürgen Haase
The electronic properties of high-temperature superconducting cuprates are encoded in NMR data. Without microscopic theory, reliable NMR phenomenologies are in demand. Here we make use of the extensive literature data to develop a different understanding of the cuprates from the shifts of the ${CuO}_{2}$ plane. The Cu shift analysis is based only on the symmetry of the two Cu hyperfine couplings, without assumptions about their size. We use an anisotropic $A_{α}$ and isotropic B, as from atomic Cu orbitals, and find two spin components (A- and B-spins) that explain all the shift data. The components differ in size and temperature dependence according to simple rules. Upon doping the cuprates, metallic B-spin appears above a pseudogap temperature, which is shared with the A-spin. Further doping decreases the pseudogap temperature and increases the B-spin, but less so the A-spin. The apparent linear rate of increase in the density of states of the B-spin with doping is nearly threefold above $x = 0.20$ , where the pseudogap disappears. The pseudogap temperature is a measure of the coupling between A and B, which suppresses the shifts but not nuclear relaxation. Spin-singlet pairing involves A and B according to three simple condensation rates, which will be discussed. The optimal $T_{c}$ demands a special match between A and B. However, the shifts do not simply predict the highest $T_{c}$ of all cuprates, in contrast to nuclear relaxation anisotropy and charge sharing between planar Cu and O. Relations to other probes are discussed.
Open Access
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Cited by 2
- 5 February 2026
- Published by MDPI AG in Condensed Matter
Two-Carrier Description of Cuprate Superconductors from NMR
by Daniel Bandur, Abigail Lee, Jakob Nachtigal, Stefan Tsankov, Jürgen Haase
Cuprates currently hold the record for the highest temperature superconductivity at ambient pressure, but the microscopic understanding of these materials remains elusive. Here, we utilize nuclear magnetic resonance (NMR) data of planar oxygen and copper from essentially all hole-doped cuprates to provide a universal phenomenology relating the NMR spin shifts, which measure the electronic spin polarization at a given nucleus, with the superconducting dome and maximum critical temperature. There appear to be two separate contributions to the spin shift in planar copper, only one of which is seen at the oxygen site, and we associate them with two different types of carriers. Upon disentangling these two components, their relative size is shown to correlate not only with the doping dependence of the superconducting dome but also with the variation in maximum superconducting critical temperature, $T_{c, \max}$ , between different families. One of these components is independent of family and resides in the hybridized planar orbitals of Cu and O. The second component, in contrast, is predominately isotropic and encodes the differences between the families. It is thus related to the charge transfer gap and planar hole sharing. Our findings offer universal insight which should prove useful in the continuing development of a comprehensive theory of the cuprates, as well as an indication of how it may be possible to engineer materials with higher critical temperatures.
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- 5 February 2026
- Published by MDPI AG in Condensed Matter
Open Access
Two-Carrier Description of Cuprate Superconductors from NMR
by Daniel Bandur, Abigail Lee, Jakob Nachtigal, Stefan Tsankov, Jürgen Haase
Cuprates currently hold the record for the highest temperature superconductivity at ambient pressure, but the microscopic understanding of these materials remains elusive. Here, we utilize nuclear magnetic resonance (NMR) data of planar oxygen and copper from essentially all hole-doped cuprates to provide a universal phenomenology relating the NMR spin shifts, which measure the electronic spin polarization at a given nucleus, with the superconducting dome and maximum critical temperature. There appear to be two separate contributions to the spin shift in planar copper, only one of which is seen at the oxygen site, and we associate them with two different types of carriers. Upon disentangling these two components, their relative size is shown to correlate not only with the doping dependence of the superconducting dome but also with the variation in maximum superconducting critical temperature, $T_{c, \max}$ , between different families. One of these components is independent of family and resides in the hybridized planar orbitals of Cu and O. The second component, in contrast, is predominately isotropic and encodes the differences between the families. It is thus related to the charge transfer gap and planar hole sharing. Our findings offer universal insight which should prove useful in the continuing development of a comprehensive theory of the cuprates, as well as an indication of how it may be possible to engineer materials with higher critical temperatures.
Cited by 2
Open Access
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Cited by 3
- 30 October 2025
- Published by MDPI AG in Condensed Matter
Nanoscale Lattice Heterostructure in High-Tc Superconductors
by Annette Bussmann-Holder, Jürgen Haase, Hugo Keller, Reinhard K. Kremer, Sergei I. Mukhin, Alexey P. Menushenkov, Andrei Ivanov, Alexey Kuznetsov, Victor Velasco, Steven D. Conradson, et al.
Low-temperature superconductivity has been known since 1957 to be described by BCS theory for effective single-band metals controlled by the density of states at the Fermi level, very far from band edges, the electron–phonon coupling constant l, and the energy of the boson in the pairing interaction w₀, but BCS has failed to predict high-temperature superconductivity in different materials above about 23 K. High-temperature superconductivity above 35 K, since 1986, has been a matter of materials science, where manipulating the lattice complexity of high-temperature superconducting ceramic oxides (HTSCs) has driven materials scientists to grow new HTSC quantum materials up to 138 K in HgBa₂Ca₂Cu₃O₈ (Hg1223) at ambient pressure and near room temperature in pressurized hydrides. This perspective covers the major results of materials scientists over the last 39 years in terms of investigating the role of lattice inhomogeneity detected in these new quantum complex materials. We highlight the nanoscale heterogeneity in these complex materials and elucidate their special role played in the physics of HTSCs. Especially, it is highlighted that the geometry of lattice and charge complex heterogeneity at the nanoscale is essential and intrinsic in the mechanism of rising quantum coherence at high temperatures.
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- 30 October 2025
- Published by MDPI AG in Condensed Matter
Open Access
Nanoscale Lattice Heterostructure in High-Tc Superconductors
by Annette Bussmann-Holder, Jürgen Haase, Hugo Keller, Reinhard K. Kremer, Sergei I. Mukhin, Alexey P. Menushenkov, Andrei Ivanov, Alexey Kuznetsov, Victor Velasco, Steven D. Conradson, et al.
Low-temperature superconductivity has been known since 1957 to be described by BCS theory for effective single-band metals controlled by the density of states at the Fermi level, very far from band edges, the electron–phonon coupling constant l, and the energy of the boson in the pairing interaction w₀, but BCS has failed to predict high-temperature superconductivity in different materials above about 23 K. High-temperature superconductivity above 35 K, since 1986, has been a matter of materials science, where manipulating the lattice complexity of high-temperature superconducting ceramic oxides (HTSCs) has driven materials scientists to grow new HTSC quantum materials up to 138 K in HgBa₂Ca₂Cu₃O₈ (Hg1223) at ambient pressure and near room temperature in pressurized hydrides. This perspective covers the major results of materials scientists over the last 39 years in terms of investigating the role of lattice inhomogeneity detected in these new quantum complex materials. We highlight the nanoscale heterogeneity in these complex materials and elucidate their special role played in the physics of HTSCs. Especially, it is highlighted that the geometry of lattice and charge complex heterogeneity at the nanoscale is essential and intrinsic in the mechanism of rising quantum coherence at high temperatures.
Cited by 3
Open Access
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- 12 August 2025
- Published by arXiv in arXiv
Nanoscale lattice heterostructure in high Tc superconductors
by Annette Bussmann-Holder, Jürgen Haase, Hugo Keller, Reinhard K. Kremer, Sergei I. Mukhin, Alexey Menushenkov, Andrei Ivanov, Alexey Kuznetsov, Victor Velasco, Steven D. Conradson, et al.
Low temperature superconductivity was known since 1957 to be described by BCS theory for an effective single band metals controlled by the density of states at the Fermi level, very far from band edges, the electron phonon coupling, and the energy of the boson in the pairing interaction w0, but BCS has failed to predict high temperature superconductivity in different materials above about 23 K. High temperature superconductivity above 35 K since 1986 has been a matter of materials science where manipulating the lattice complexity of high temperature superconducting ceramic oxides (HTSC) has driven material scientists to grow new HTSC quantum materials up to 138K in HgBa2Ca2Cu3O8 (Hg1223) at ambient pressure and near room temperature in pressurized hydrides. This perspective covers the major results of materials scientist in these last 39 years investigating the role of lattice inhomogeneity detected in these new quantum complex materials. We highlight the nanoscale heterogeneity in these complex materials and elucidate their special role played in the physics for HTSC. Especially, it is pointed out that the geometry of lattice and charge complex heterogeneity at nanoscale is essential and intrinsic in the mechanism of rising quantum coherence at high temperature
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- 12 August 2025
- Published by arXiv in arXiv
Open Access
Nanoscale lattice heterostructure in high Tc superconductors
by Annette Bussmann-Holder, Jürgen Haase, Hugo Keller, Reinhard K. Kremer, Sergei I. Mukhin, Alexey Menushenkov, Andrei Ivanov, Alexey Kuznetsov, Victor Velasco, Steven D. Conradson, et al.
Low temperature superconductivity was known since 1957 to be described by BCS theory for an effective single band metals controlled by the density of states at the Fermi level, very far from band edges, the electron phonon coupling, and the energy of the boson in the pairing interaction w0, but BCS has failed to predict high temperature superconductivity in different materials above about 23 K. High temperature superconductivity above 35 K since 1986 has been a matter of materials science where manipulating the lattice complexity of high temperature superconducting ceramic oxides (HTSC) has driven material scientists to grow new HTSC quantum materials up to 138K in HgBa2Ca2Cu3O8 (Hg1223) at ambient pressure and near room temperature in pressurized hydrides. This perspective covers the major results of materials scientist in these last 39 years investigating the role of lattice inhomogeneity detected in these new quantum complex materials. We highlight the nanoscale heterogeneity in these complex materials and elucidate their special role played in the physics for HTSC. Especially, it is pointed out that the geometry of lattice and charge complex heterogeneity at nanoscale is essential and intrinsic in the mechanism of rising quantum coherence at high temperature
Open Access
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Cited by 5
- 11 August 2025
- Published by American Physical Society (APS) in Physical Review B
Nuclear magnetic resonance far off the Larmor frequency: Nonsecular resonances in ${CaF}_{2}$
by Michael Jurkutat, Kajum Safiullin, Pooja Singh, Stephan L. Grage, Jürgen Haase, Boris V. Fine, Benno Meier
High field magnetic resonance of nuclear spins is normally carried out at or near the Larmor frequency Ω 0 . Here, we report an observation of nonsecular nuclear spin resonances far off Ω 0 . These originate from nonsecular terms of the nuclear spin-spin interaction and provide means for the control of coupled two level systems. In systems of equivalent nuclear spins, nonsecular resonances were predicted to lead to anomalous, fast relaxation of the nuclear spin polarization. We report experimental results that are in excellent agreement with the predicted behavior.
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- 11 August 2025
- Published by American Physical Society (APS) in Physical Review B
Open Access
Nuclear magnetic resonance far off the Larmor frequency: Nonsecular resonances in ${CaF}_{2}$
by Michael Jurkutat, Kajum Safiullin, Pooja Singh, Stephan L. Grage, Jürgen Haase, Boris V. Fine, Benno Meier
High field magnetic resonance of nuclear spins is normally carried out at or near the Larmor frequency Ω 0 . Here, we report an observation of nonsecular nuclear spin resonances far off Ω 0 . These originate from nonsecular terms of the nuclear spin-spin interaction and provide means for the control of coupled two level systems. In systems of equivalent nuclear spins, nonsecular resonances were predicted to lead to anomalous, fast relaxation of the nuclear spin polarization. We report experimental results that are in excellent agreement with the predicted behavior.
Cited by 5
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Cited by 1
- 27 April 2025
- Published by Elsevier in Physica C: Superconductivity and its Applications
Stripe-like correlations in the cuprates from oxygen NMR
by Daniel Bandur, Abigail Lee, Stefan Tsankov, Andreas Erb, Jürgen Haase
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- 27 April 2025
- Published by Elsevier in Physica C: Superconductivity and its Applications
Open Access
Stripe-like correlations in the cuprates from oxygen NMR
by Daniel Bandur, Abigail Lee, Stefan Tsankov, Andreas Erb, Jürgen Haase
Cited by 1
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Cited by 3
- 25 October 2023
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry C
H/D Exchange of n-Butane on In-Modified Zeolite BEA Investigated by ¹H Magic-Angle Spinning Nuclear Magnetic Resonance In Situ
by Sergei S. Arzumanov, Anton A. Gabrienko, Alexander V. Toktarev, Dieter Freude, Jürgen Haase, Alexander G. Stepanov
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- 25 October 2023
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry C
H/D Exchange of n-Butane on In-Modified Zeolite BEA Investigated by ¹H Magic-Angle Spinning Nuclear Magnetic Resonance In Situ
by Sergei S. Arzumanov, Anton A. Gabrienko, Alexander V. Toktarev, Dieter Freude, Jürgen Haase, Alexander G. Stepanov
Cited by 3
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Cited by 5
- 25 September 2023
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry C
NMR Studies of the Rehydroxylation of Ceramic Materials with Respect to Rehydroxylation Dating
by Marija Avramovska, Dieter Freude, Wilhelm Schwieger, Tobias Fey, Jörg Kärger, Jürgen Haase
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- 25 September 2023
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry C
NMR Studies of the Rehydroxylation of Ceramic Materials with Respect to Rehydroxylation Dating
by Marija Avramovska, Dieter Freude, Wilhelm Schwieger, Tobias Fey, Jörg Kärger, Jürgen Haase
Cited by 5
Open Access
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Cited by 33
- 6 January 2023
- Published by National Academy of Sciences in Proceedings of the National Academy of Sciences
How pressure enhances the critical temperature of superconductivity in YBa ₂ Cu ₃ O _{6+
y}
by Michael Jurkutat, Carsten Kattinger, Stefan Tsankov, Richard Reznicek, Andreas Erb, Jürgen Haase
High-temperature superconducting cuprates respond to doping with a dome-like dependence of their critical temperature ( T _c ). But the family-specific maximum T _c can be surpassed by application of pressure, a compelling observation known for decades. We investigate the phenomenon with high-pressure anvil cell NMR and measure the charge content at planar Cu and O, and with it the doping of the ubiquitous CuO ₂ plane with atomic-scale resolution. We find that pressure increases the overall hole doping, as widely assumed, but when it enhances T _c above what can be achieved by doping, pressure leads to a hole redistribution favoring planar O. This is similar to the observation that the family-specific maximum T _c is higher for materials where the hole content at planar O is higher at the expense of that at planar Cu. The latter reflects dependence of the maximum T _c on the Cu–O bond covalence and the charge-transfer gap. The results presented here indicate that the pressure-induced enhancement of the maximum T _c points to the same mechanism.
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- 6 January 2023
- Published by National Academy of Sciences in Proceedings of the National Academy of Sciences
Open Access
How pressure enhances the critical temperature of superconductivity in YBa ₂ Cu ₃ O _{6+
y}
by Michael Jurkutat, Carsten Kattinger, Stefan Tsankov, Richard Reznicek, Andreas Erb, Jürgen Haase
High-temperature superconducting cuprates respond to doping with a dome-like dependence of their critical temperature ( T _c ). But the family-specific maximum T _c can be surpassed by application of pressure, a compelling observation known for decades. We investigate the phenomenon with high-pressure anvil cell NMR and measure the charge content at planar Cu and O, and with it the doping of the ubiquitous CuO ₂ plane with atomic-scale resolution. We find that pressure increases the overall hole doping, as widely assumed, but when it enhances T _c above what can be achieved by doping, pressure leads to a hole redistribution favoring planar O. This is similar to the observation that the family-specific maximum T _c is higher for materials where the hole content at planar O is higher at the expense of that at planar Cu. The latter reflects dependence of the maximum T _c on the Cu–O bond covalence and the charge-transfer gap. The results presented here indicate that the pressure-induced enhancement of the maximum T _c points to the same mechanism.
Cited by 33

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