Setti Thirupathaiah
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Setti Thirupathaiah has a total of 193 co-authors. Here are the top co-authors by number of shared publications:
Achintya Low
19 shared publicationsSusanta Ghosh
19 shared publicationsSusmita Changdar
Leibniz Institute for Solid State and Materials Research, IFW Dresden, Dresden, Germany
16 shared publicationsAwadhesh Narayan
9 shared publications- Shubham Purwar
S. N. Bose National Centre for Basic Sciences
9 shared publications B. Büchner
8 shared publications
Latest Publications
- 8 September 2026
- Published by American Physical Society (APS) in Physical Review B
- Vol. 114 (14) , 144407
Tunable magnetic frustration in the Cu-Ru based double-perovskite La 2 − x Sm x CuRuO 6 ( x = 0 , 1, 2) oxides
In this study, we investigate the structural, magnetic, and electronic properties of the copper-ruthenate-based oxide double perovskite ${\mathrm{La}}_{2\text{\ensuremath{-}}x}{\mathrm{Sm}}_{x}{\mathrm{CuRuO}}_{6}$ ($x$ = 0, 1, 2), synthesized by the solid-state reaction method. X-ray diffraction analysis reveals that all compounds crystallize in monoclinic symmetry, with the degree of structural distortion increasing from ${\mathrm{La}}^{3+}$ to the smaller cation ${\mathrm{Sm}}^{3+}$. Electrical resistivity studies indicate insulating behavior in all compounds, with variable-range-hopping domination at low temperatures because of the presence of antisite disorder. AC susceptibility and heat capacity measurements suggest suppression of frustration in Sm-bearing compounds, affecting the magnetic behavior. Our first-principles calculations suggest that the combined effects of lattice distortion and Sm magnetism play a crucial role in weakening magnetic frustration, thereby rationalizing the experimental observations. These findings shed light on the complex interplay of crystal structure and magnetism in Cu-Ru double perovskites and open up an avenue for tuning magnetic properties through rare-earth-ion substitution.- 8 September 2026
- Published by American Physical Society (APS) in Physical Review B
- Vol. 114 (14) , 144407
Tunable magnetic frustration in the Cu-Ru based double-perovskite La 2 − x Sm x CuRuO 6 ( x = 0 , 1, 2) oxides
In this study, we investigate the structural, magnetic, and electronic properties of the copper-ruthenate-based oxide double perovskite ${\mathrm{La}}_{2\text{\ensuremath{-}}x}{\mathrm{Sm}}_{x}{\mathrm{CuRuO}}_{6}$ ($x$ = 0, 1, 2), synthesized by the solid-state reaction method. X-ray diffraction analysis reveals that all compounds crystallize in monoclinic symmetry, with the degree of structural distortion increasing from ${\mathrm{La}}^{3+}$ to the smaller cation ${\mathrm{Sm}}^{3+}$. Electrical resistivity studies indicate insulating behavior in all compounds, with variable-range-hopping domination at low temperatures because of the presence of antisite disorder. AC susceptibility and heat capacity measurements suggest suppression of frustration in Sm-bearing compounds, affecting the magnetic behavior. Our first-principles calculations suggest that the combined effects of lattice distortion and Sm magnetism play a crucial role in weakening magnetic frustration, thereby rationalizing the experimental observations. These findings shed light on the complex interplay of crystal structure and magnetism in Cu-Ru double perovskites and open up an avenue for tuning magnetic properties through rare-earth-ion substitution.- Open Access
- 20 August 2026
- Published by American Physical Society (APS) in Physical Review B
- Vol. 114 (10) , 105414
Identifying open-orbit topological surface states in dual topological semimetal TaSb 2
TaSb 2 , a member of the TmPn 2 family of materials, hosts the very rare dual topological phase—weak topological insulating state and topological crystalline insulating state along different crystallographic orientations. So far, studies on the electronic structure of TmPn 2 compounds have focused on their overall electronic structure and the bulk open-orbit Fermi surfaces. Using angle-resolved photoemission spectroscopy, density functional theory calculations, and transport measurements, we distinguish the intertwined bulk and surface states on the weakly topological ( 20 1 ¯ ) plane of TaSb 2 . We identify multiple electron- and holelike bulk bands, yielding a near-perfect carrier compensation. Crucially, we observe open-orbit FSs near M ¯ and parallel to Γ ¯ − Y ¯ direction that are entirely of surface origin. The surface states also exhibit band crossing at ∼ 0.6 eV below Fermi level at the time-reversal invariant momentum M ¯ , indicating nontrivial band topology. Consistent with this, magnetotransport measurements display weak antilocalization, establishing TaSb 2 as a platform for spin-polarized topological transport on a weakly topological surface.
- 20 August 2026
- Published by American Physical Society (APS) in Physical Review B
- Vol. 114 (10) , 105414
Open AccessIdentifying open-orbit topological surface states in dual topological semimetal TaSb 2
TaSb 2 , a member of the TmPn 2 family of materials, hosts the very rare dual topological phase—weak topological insulating state and topological crystalline insulating state along different crystallographic orientations. So far, studies on the electronic structure of TmPn 2 compounds have focused on their overall electronic structure and the bulk open-orbit Fermi surfaces. Using angle-resolved photoemission spectroscopy, density functional theory calculations, and transport measurements, we distinguish the intertwined bulk and surface states on the weakly topological ( 20 1 ¯ ) plane of TaSb 2 . We identify multiple electron- and holelike bulk bands, yielding a near-perfect carrier compensation. Crucially, we observe open-orbit FSs near M ¯ and parallel to Γ ¯ − Y ¯ direction that are entirely of surface origin. The surface states also exhibit band crossing at ∼ 0.6 eV below Fermi level at the time-reversal invariant momentum M ¯ , indicating nontrivial band topology. Consistent with this, magnetotransport measurements display weak antilocalization, establishing TaSb 2 as a platform for spin-polarized topological transport on a weakly topological surface.
- 10 July 2026
- Published by American Physical Society (APS) in Physical Review B
- Vol. 114 (1)
Ultrafast dynamics of spin-orbit entangled excitons and magnetic correlations in the van der Waals antiferromagnet NiPS 3
- 10 July 2026
- Published by American Physical Society (APS) in Physical Review B
- Vol. 114 (1)
Ultrafast dynamics of spin-orbit entangled excitons and magnetic correlations in the van der Waals antiferromagnet NiPS 3
- 26 March 2026
- Published by American Physical Society (APS) in Physical Review Materials
- Vol. 10 (3)
Accessing quasiflat f bands to harvest large Berry curvature in NdGaSi
- 26 March 2026
- Published by American Physical Society (APS) in Physical Review Materials
- Vol. 10 (3)
Accessing quasiflat f bands to harvest large Berry curvature in NdGaSi
- Open Access
Identifying open-orbit topological surface states in dual topological semimetal TaSb$_2$
TaSb$_2$, a member of the transition metal dipnictide family of materials, hosts the very rare dual topological phase - weak topological insulating state and topological crystalline insulating state along different crystallographic orientations. So far, studies on the electronic structure of transition metal dipnictides have focused on their overall electronic structure and the bulk open-orbit Fermi surfaces. Using angle-resolved photoemission spectroscopy, density functional theory calculations, and transport measurements, we distinguish the intertwined bulk and surface states on the weakly topological $(20\bar{1})$ plane of TaSb$_2$. We identify multiple electron- and hole-like bulk bands, yielding a near-perfect carrier compensation. Crucially, we observe open-orbit FSs parallel to $\bar{L}$-$\bar{Y}$ direction that are entirely of surface origin. Circular-dichroism ARPES reveals $k \rightarrow -k$ spectral reversal, indicating spin-momentum locking and the topological nature of these surface states. Consistent with this, magnetotransport measurements display weak antilocalization, establishing TaSb$_2$ as a platform for spin-polarized topological transport on a weakly topological surface.Open AccessIdentifying open-orbit topological surface states in dual topological semimetal TaSb$_2$
TaSb$_2$, a member of the transition metal dipnictide family of materials, hosts the very rare dual topological phase - weak topological insulating state and topological crystalline insulating state along different crystallographic orientations. So far, studies on the electronic structure of transition metal dipnictides have focused on their overall electronic structure and the bulk open-orbit Fermi surfaces. Using angle-resolved photoemission spectroscopy, density functional theory calculations, and transport measurements, we distinguish the intertwined bulk and surface states on the weakly topological $(20\bar{1})$ plane of TaSb$_2$. We identify multiple electron- and hole-like bulk bands, yielding a near-perfect carrier compensation. Crucially, we observe open-orbit FSs parallel to $\bar{L}$-$\bar{Y}$ direction that are entirely of surface origin. Circular-dichroism ARPES reveals $k \rightarrow -k$ spectral reversal, indicating spin-momentum locking and the topological nature of these surface states. Consistent with this, magnetotransport measurements display weak antilocalization, establishing TaSb$_2$ as a platform for spin-polarized topological transport on a weakly topological surface. - Open Access
- 19 November 2025
- Published by Springer Nature in Nature
- Vol. 647 (8090) , 613-618
Topological nodal i-wave superconductivity in PtBi2
Most superconducting materials are well understood and conventional—that is, the pairs of electrons that cause the superconductivity by their condensation have the highest possible symmetry. Famous exceptions are the enigmatic high-temperature (high- T c ) cuprate superconductors 1 . Nodes in their superconducting gap are the fingerprint of their unconventional character and imply superconducting pairing of d -wave symmetry. Here, by using angle-resolved photoemission spectroscopy, we observe that the Weyl semimetal PtBi 2 harbours nodes in its superconducting gap, implying unconventional i -wave pairing symmetry. At temperatures below 10 K, the superconductivity in PtBi 2 gaps out its topological surface states, the Fermi arcs, whereas its bulk states remain normal 2 . The nodes in the superconducting gap that we observe are located exactly at the centre of the Fermi arcs and imply the presence of topologically protected Majorana cones around this locus in momentum space. From this, we infer theoretically that robust zero-energy Majorana flat bands emerge at surface step edges. This establishes PtBi 2 surfaces not only as unconventional, topological i -wave superconductors but also as a promising material platform in the ongoing effort to generate and manipulate Majorana bound states.
- 19 November 2025
- Published by Springer Nature in Nature
- Vol. 647 (8090) , 613-618
Open AccessTopological nodal i-wave superconductivity in PtBi2
Most superconducting materials are well understood and conventional—that is, the pairs of electrons that cause the superconductivity by their condensation have the highest possible symmetry. Famous exceptions are the enigmatic high-temperature (high- T c ) cuprate superconductors 1 . Nodes in their superconducting gap are the fingerprint of their unconventional character and imply superconducting pairing of d -wave symmetry. Here, by using angle-resolved photoemission spectroscopy, we observe that the Weyl semimetal PtBi 2 harbours nodes in its superconducting gap, implying unconventional i -wave pairing symmetry. At temperatures below 10 K, the superconductivity in PtBi 2 gaps out its topological surface states, the Fermi arcs, whereas its bulk states remain normal 2 . The nodes in the superconducting gap that we observe are located exactly at the centre of the Fermi arcs and imply the presence of topologically protected Majorana cones around this locus in momentum space. From this, we infer theoretically that robust zero-energy Majorana flat bands emerge at surface step edges. This establishes PtBi 2 surfaces not only as unconventional, topological i -wave superconductors but also as a promising material platform in the ongoing effort to generate and manipulate Majorana bound states.
- 10 September 2025
- Published by Elsevier in Journal of Alloys and Compounds
- Vol. 1040
Extremely large and angle-dependent magnetoresistance in kagome Dirac semimetal RFe 6 Sn 6 (R=Ho, Dy)
- 10 September 2025
- Published by Elsevier in Journal of Alloys and Compounds
- Vol. 1040
Extremely large and angle-dependent magnetoresistance in kagome Dirac semimetal RFe 6 Sn 6 (R=Ho, Dy)
- Open Access
Extremely Large and Angle-Dependent Magnetoresistance in Kagome Dirac Semimetal RFe$_6$Sn$_6$ (R=Ho, Dy)
We report on the electronic, magnetic, and magneto-transport properties of Fe-based kagome Dirac system, RFe$_6$Sn$_6$ (R = Ho, Dy). Magnetic properties study reveals an antiferromagnetic order with N$\acute{e}$el temperature of $T_N \approx$ 570 K. Additionally, a weak ferromagnetic order emerge at low temperatures. Magnetotransport measurements demonstrate an extremely large magnetoresistance (XMR) reaching as high as $3\times 10^{3} \%$ for HoFe$_6$Sn$_6$ and $ 1\times 10^{3} \%$ for DyFe$_6$Sn$_6$ when measured at 2 K with 9 T of magnetic field. The semi-classical two-band model fitting of the Hall conductivity reveals nearly perfect electron-hole compensation and high carrier mobility, which leads to XMR behaviour in these system. Further, we identify large magnetoresistance anisotropy for the magnetic fields applied in different crystallographic orientations. In addition, considerable modification in the angle-dependent magnetoresistance (ADMR) pattern has been noticed between 2 and 50 K, indicating temperature-dependent changes in the Fermi surface topology of these systems.Open AccessExtremely Large and Angle-Dependent Magnetoresistance in Kagome Dirac Semimetal RFe$_6$Sn$_6$ (R=Ho, Dy)
We report on the electronic, magnetic, and magneto-transport properties of Fe-based kagome Dirac system, RFe$_6$Sn$_6$ (R = Ho, Dy). Magnetic properties study reveals an antiferromagnetic order with N$\acute{e}$el temperature of $T_N \approx$ 570 K. Additionally, a weak ferromagnetic order emerge at low temperatures. Magnetotransport measurements demonstrate an extremely large magnetoresistance (XMR) reaching as high as $3\times 10^{3} \%$ for HoFe$_6$Sn$_6$ and $ 1\times 10^{3} \%$ for DyFe$_6$Sn$_6$ when measured at 2 K with 9 T of magnetic field. The semi-classical two-band model fitting of the Hall conductivity reveals nearly perfect electron-hole compensation and high carrier mobility, which leads to XMR behaviour in these system. Further, we identify large magnetoresistance anisotropy for the magnetic fields applied in different crystallographic orientations. In addition, considerable modification in the angle-dependent magnetoresistance (ADMR) pattern has been noticed between 2 and 50 K, indicating temperature-dependent changes in the Fermi surface topology of these systems. - Open Access
Spin-reorientation Driven Temperature Dependent Intrinsic Anomalous Hall Conductivity in Fe$_3$Ge, a Ferromagnetic Topological Metal
We investigate the temperature dependence of the intrinsic anomalous Hall conductivity in Fe$_3$Ge, which is a ferromagnetic topological metal. We observe a significant anisotropy in the anomalous Hall conductivity between in-plane and out-of-plane directions. We further identify that the total Hall conductivity is contributed extrinsically due to the skew-scattering mechanism and intrinsically due to nonzero Berry curvature in the momentum space. Most importantly, we demonstrate the temperature dependence of the intrinsic Hall contribution, a rare phenomenon to visualize experimentally, due to tuning the easy-magnetic axis from the out-of-plane to the in-plane with decreasing temperature. We also show that the extrinsic Hall conductivity decreases with temperature as $σ_{xy}^{ext}(T)=\frac{σ_{xy0}^{ext}}{(aT+1)^2}$ due to electron-phonon scattering.Open AccessSpin-reorientation Driven Temperature Dependent Intrinsic Anomalous Hall Conductivity in Fe$_3$Ge, a Ferromagnetic Topological Metal
We investigate the temperature dependence of the intrinsic anomalous Hall conductivity in Fe$_3$Ge, which is a ferromagnetic topological metal. We observe a significant anisotropy in the anomalous Hall conductivity between in-plane and out-of-plane directions. We further identify that the total Hall conductivity is contributed extrinsically due to the skew-scattering mechanism and intrinsically due to nonzero Berry curvature in the momentum space. Most importantly, we demonstrate the temperature dependence of the intrinsic Hall contribution, a rare phenomenon to visualize experimentally, due to tuning the easy-magnetic axis from the out-of-plane to the in-plane with decreasing temperature. We also show that the extrinsic Hall conductivity decreases with temperature as $σ_{xy}^{ext}(T)=\frac{σ_{xy0}^{ext}}{(aT+1)^2}$ due to electron-phonon scattering.