Speaker
Jianjun Ying
University of Science and Technology of China
Date＆Time
2021.12.18（Sat）PM 15:00
Location
Tencent Meeting ID: 759-859-708
Abstract
The recently discovered layered kagome metal AV3Sb5 (A = K, Rb, and Cs) provides us a new playground to study the interplay of superconductivity and CDW state by involving nontrivial topology of band structures. Here, we present high-pressure electrical transport measurements for CsV3Sb5. The CDW is completely suppressed at a critical pressure ~2 GPa together with a maximum Tc of about 8 K. In contrast to a common dome-like behavior, the pressure-dependent Tc shows an unexpected double-peak behavior below 10 GPa. More interestingly, a new dome-like superconducting phase emerges above 14 GPa, which could be attributed to the dimensional crossover at high pressure. A giant anomalous Hall conductivity is observed exactly following the CDW transition at ambient pressure. The evolution of the anomalous Hall conductivity under pressure were detailed investigated. Our discoveries reveal anomalous physical properties of CsV3Sb5 at high pressure, pointing to an unconventional nature of the CDW and superconductivity.
