Yonghui Zhou

In many charge‐density‐wave (CDW) materials, superconductivity emerges as CDW order collapses, producing a dome‐shaped phase diagram commonly associated with quantum criticality or direct competition between the two orders. Here, a distinct pressure‐tuned case is identified in NdSeTe ₂ , where the superconducting dome is fully embedded within a persistent CDW state. Electrical resistivity measurements reveal a conventional superconducting dome with a maximum transition temperature of T _C ≈ 1.8 K near P _C ≈ 2.6 GPa, where long‐range CDW signatures disappear from transport. In striking contrast, high‐pressure, low‐temperature Raman spectroscopy uncovers short‐range CDW correlations that remain hidden to resistivity, emerge beyond P _C , and persist up to ∼10.0 GPa, spanning the entire superconducting dome. Synchrotron X‐ray diffraction detects no structural transition up to 32.4 GPa, indicating that the CDW evolution is electronic in origin. These results establish an unusual phase diagram in which superconductivity develops within a persistent short‐range CDW background, offering new insight into pressure‐tuned collective states in low‐dimensional quantum materials.

Layered transition metal dichalcogenides host a rich landscape of correlated electronic phases that are profoundly sensitive to interlayer coupling. Although both thinning and pressure have been individually used to tune these properties, the high-pressure behavior of low-dimensional systems remains largely unexplored. Here, we propose a synergistic tuning strategy by combination of organic cation intercalation and pressure to simulate the properties of low-dimensional materials under pressure. We show that intercalating cetyltrimethylammonium cations into the bulk 1 T -TaS ₂ significantly weakens the interlayer coupling and leads to an effective reduction in dimensionality. Moreover, the intercalated sample exhibits distinct features under high pressure as compared with non-intercalated one. The superconductivity in the intercalated sample is induced accompanied by a complete suppression of nearly commensurate charge density wave order, differing from the melting of commensurate state in the non-intercalated case. Upon further compression up to 58.1 GPa, the superconductivity displays a dome-shaped evolution, also without showing re-enhancement that presented in the non-intercalated sample. More strikingly, the superconductivity in the intercalated 1 T -TaS ₂ displays signatures of Ising superconductivity, with its in-plane upper critical field exceeding twice the Pauli paramagnetic limit. Our findings not only provide a powerful route for tuning the collective electronic states but also open up possibilities in searching for emergent phenomena in low-dimensional materials.

LnSb _x Te _{2− x − δ} (Ln = lanthanide) family has recently attracted intensive research interest due to its fruitful physical properties, such as non-trivial topological state, complex magnetism, charge density wave and skyrmion phase, making it a good platform to study the interplay among topology, magnetism and electronic correlation effect. Here, we choose GdSb _0.46 Te _1.48 , evidenced as an ideal antiferromagnetic (AFM) topological semimetal, and investigate its electronic and magnetic properties under high magnetic field along three crystallographic orientations via electrical transport and magnetization measurements. Compared with previous studies, here we have revealed a series of new magnetic phases (labeled as PP-4–PP-7) through magnetoresistance measurements. Combined with the magnetization data, we conclude that these new discovered phases are also likely AFM phases while their spin configurations are different. Moreover, the rich magnetic phases of GdSb _0.46 Te _1.48 could be attributed to the strong magnetocrystalline anisotropy.

The observation of the planar Hall effect (PHE) illuminates the spin textures and topological properties of materials, indicating potential applications in quantum computing and electronic devices. Here, we present a study on the planar Hall transport of topological insulator NaCd4As3 single crystals. When the magnetic field is rotated within the sample plane relative to the current direction, we observe remarkable planar Hall resistivity and giant planar anisotropic magnetoresistance (AMR), both consistent with the theoretical expression of the PHE. Further analysis reveals that the orbital magnetoresistance effect, unrelated to surface electrons from topological surface states or bulk electrons from nontrivial Berry phases, lays a dominant role in the PHE in NaCd4As3. Additionally, the AMR ratio reaches −43% at 3 K under 14 T and remains −9% at room temperature, markedly exceeding that of traditional ferromagnetic metals. These findings provide a platform for understanding the PHE mechanism in topological insulators and highlight the potential of NaCd4As3 for angle and magnetic field detection applications.

The natural bulk van der Waals heterostructures compound 6R-TaS2 consists of alternate stacking 1T- and 1H-TaS2 monolayers, creating a unique system that incorporates charge-density-wave (CDW) order and superconductivity (SC) in distinct monolayers. Here, after confirming that the 2D nature of the lattice is preserved up to 8 GPa in 6R-TaS2, we documented an unusual evolution of CDW and SC by conducting highpressure electronic transport measurements. Upon compression, we observe a gradual suppression of CDW within the 1T-layers, while the SC exhibits a dome-shaped behavior that terminates at a critical pressure Pc around 2.9 GPa. By taking account of the fact that the substantial suppression of SC is concomitant with the complete collapse of CDW order at Pc, we argue that the 6R-TaS2 behaves like a stack of Josephson junctions and thus the suppressed superconductivity can be attributed to the weakening of Josephson coupling associated with the presence of CDW fluctuations in the 1T-layers. Furthermore, the SC reversely enhances above Pc, implying the development of emergent superconductivity in the 1T-layers after the melting of T-layer CDW orders. These results show that the 6R-TaS2 not only provides a promising platform to explore emergent phenomena but also serves as a model system to study the complex interactions between competing electronic states.