Abstract
Recently discovered alongside its sister compounds KV3Sb5 and RbV3Sb5, CsV3Sb5 crystallizes with an ideal kagome network of vanadium and antimonene layers separated by alkali metal ions. This work presents the electronic properties of CsV3Sb5, demonstrating bulk superconductivity in single crystals with a Tc=2.5 K. The normal state electronic structure is studied via angle-resolved photoemission spectroscopy and density-functional theory, which categorize CsV3Sb5 as a Z2 topological metal. Multiple protected Dirac crossings are predicted in close proximity to the Fermi level (EF), and signatures of normal state correlation effects are also suggested by a high-temperature charge density wavelike instability. The implications for the formation of unconventional superconductivity in this material are discussed.
Original language | English |
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Article number | 247002 |
Journal | Physical Review Letters |
Volume | 125 |
Issue number | 24 |
DOIs | |
State | Published - Dec 10 2020 |
Externally published | Yes |
Funding
S. D. W., R. S., L. B., and B. R. O. acknowledge support from the University of California Santa Barbara Quantum Foundry, funded by the National Science Foundation (NSF DMR-1906325). Research reported here also made use of shared facilities of the UC Santa Barbara Materials Research Science and Engineering Center (NSF DMR-1720256). B. R. O. and P. M. S. also acknowledge support from the California NanoSystems Institute through the Elings fellowship program. S. M. L. T. has been supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1650114. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. J.-F. H. and Y. H. were supported by the USTC start-up fund. The ARPES measurements were carried out under the user proposal program of SSRL, which is operated by the Office of Basic Energy Sciences, U.S. DOE, under Contract No. DE-AC02-76SF00515. This research used beam line 28-ID-1 of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. Shared computing facilities of the Center for Scientific Computing at UC Santa Barbara, supported by NSF CNS-1725797. Work at the Materials Science Division at Argonne National Laboratory (single crystal diffuse scattering) was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division.