发表机构
Center for High Pressure Science & Technology Advanced Research; Hefei National Laboratory; Institute of Physics, Chinese Academy of Sciences; Department of Physics, Beijing Key Laboratory of Optoelectronic Functional Materials and Micro-Nano Devices, Renmin University of China; Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences; Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments, Shanghai Advanced Research in Physical Sciences（高压科学与技术先进研究中心; 合肥国家实验室; 中国科学院物理研究所; 中国人民大学物理系，光电功能材料与微纳器件北京市重点实验室; 中国科学院上海高级研究院，上海同步辐射光源; 极端环境材料前沿研究上海市重点实验室，上海物理科学先进研究）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究首次在压缩TaRhTe4中观测到超导电性，并与TaIrTe4对比，揭示TaXTe4家族中通向超导的两种不同晶格与电子结构重构路径。
AI 中文摘要
压力可以通过晶格和正常态电子结构的性质不同的重构，将外尔半金属驱动至超导态。在此，我们报道了压缩TaRhTe4中首次观测到超导电性。这一发现使得我们能够直接比较TaRhTe4和先前研究的TaIrTe4中导致超导电性的不同重构路径，两者都属于TaXTe4（X = Rh, Ir）家族的II型外尔半金属。对于TaRhTe4，高压电阻、霍尔效应和磁电阻测量，结合同步辐射X射线衍射和第一性原理计算，揭示了在约20 GPa附近出现的超导转变，起始Tc在65.2 GPa时增至约2.6 K，并在63 GPa以上实现零电阻。超导的出现与逐渐的晶格畸变、正磁电阻的强烈抑制以及霍尔系数连续减小至零相一致。计算进一步表明，额外的类电子能带穿过费米能级（EF），且N(EF)在压缩时增加。这种演化与TaIrTe4形成对比，在TaIrTe4中，霍尔系数最初增加，然后在接近超导阈值时其压力依赖性发生反转，而结构异常则局限于较窄的压力区间。这一比较表明，TaXTe4家族中的超导电性并不与唯一的临界压力或单一的费米面重构相关联，而是可以在压力充分将低载流子外尔半金属衍生态重构为多带金属态后，通过不同的材料特定路径出现。
英文摘要
Pressure can drive Weyl semimetals toward superconductivity through qualitatively distinct reconstructions of their lattices and normal-state electronic structures. Here, we report the first observation of superconductivity in compressed TaRhTe4. This finding enables a direct comparison of the distinct reconstruction pathways leading to superconductivity in TaRhTe4 and the previously studied TaIrTe4, both of which belong to the TaXTe4 (X = Rh, Ir) family of type-II Weyl semimetals. For TaRhTe4, high-pressure electrical-resistance, Hall effect, and magnetoresistance measurements, together with synchrotron X-ray diffraction and first-principles calculations, reveal a superconducting transition that emerges near 20 GPa, with onset Tc increasing to approximately 2.6 K at 65.2 GPa and zero resistance achieved above 63 GPa. The onset of superconductivity coincides with a progressive lattice distortion, a strong suppression of the positive magnetoresistance, and a continuous decrease of the Hall coefficient toward zero. Calculations further show that additional electron-like bands cross the Fermi level (EF) and that N(EF) increases upon compression. This evolution contrasts with TaIrTe4, where the Hall coefficient initially increases before reversing its pressure dependence near the superconducting threshold, while the structural anomaly is confined to a narrower pressure interval. This comparison indicates that superconductivity in the TaXTe4 family is not tied to a unique critical pressure or a single Fermi-surface reconstruction, but can emerge through distinct material-specific pathways once pressure sufficiently reconstructs the low-carrier Weyl-semimetal-derived state into a multiband metallic regime.
Comments17 pages, 4 figures
