Vortex phase diagram of the kagome superconductor CsV3⁢Sb5

Zhang, Xinyang; Zic, Mark P.; Chen, Dong; Shekhar, Chandra; Felser, Claudia; Fisher, Ian R.; Kapitulnik, Aharon

doi:10.1103/physrevb.109.144507

Title: Vortex phase diagram of the kagome superconductor CsV₃⁢Sb₅

Journal Article · 08 April 2024 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.109.144507 · OSTI ID:2405009

^[1]; Zic, Mark P. ^[2];

^[3]; Shekhar, Chandra ^[4]; Felser, Claudia ^[4]; Fisher, Ian R. ^[5]; Kapitulnik, Aharon ^[5]

SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States); SLAC
Stanford Univ., CA (United States)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); Qingdao Univ. (China)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)

The screening response of the kagome superconductor CsV₃⁢Sb₅ was obtained from high-resolution ac mutual inductance measurements. At zero applied magnetic field and low temperatures, we observe no evidence for gapless quasiparticles, while near T_c we find evidence for enhanced fluctuations. A rich vortex state appears above H_c⁢1≈30 Oe, exhibiting successive emergence of vortex phases. For a fixed magnetic field, lowering the temperature below T_c⁡(H) leads to a wide range of vortex liquid state in a landscape of weak pinning potential, which gives rise to an irreversibility line. Further lowering the temperature, we identify the vortex melting line followed by the peak effect manifested in enhanced vortex pinning strength and critical current. Finally, we suggest that such an unusual behavior, where the peak effect region is fully contained within the vortex lattice state below the irreversibility line, is a consequence of the strong anisotropy and weak bulk pinning in CsV₃⁢Sb₅.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2405009

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Vortex phase diagram of the kagome superconductor CsV3⁢Sb5

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Title: Vortex phase diagram of the kagome superconductor CsV₃⁢Sb₅