Pressure-induced double-dome superconductivity in doped kagome metal Cs(V0.86Ta0.14)3Sb5 without charge density wave
Abstract
The vanadium-based kagome superconductor CsV3Sb5 exhibits an intricate interplay between charge density wave (CDW) and superconductivity (SC). Substituting Ta for V will suppress the CDW order and enhance superconductivity. Here, we report a high-pressure study up to 48 GPa on Ta-doped Cs(V0.86Ta0.14)3Sb5 with enhanced Tc around 5.29 K and without CDW order. At low pressures, unlike the characteristic ``M-shaped" temperature-pressure phase diagram of the pristine CsV3Sb5, the Ta-doped compound exhibits a distinct non-monotonic evolution. Initially, Tc drops slightly from 5.29 K at ambient pressure to 4.90 K at 0.33 GPa, before increasing to a maximum of 5.70 K at 0.61 GPa. Upon further compression, Tc decreases continuously to 0.98 K at 12.3 GPa. At higher pressures, Tc rises again, reaching 4.46 K at 47.7 GPa. This evolution of Tc establishes two superconducting domes under pressure, which are similar to those in CsV3Sb5. Our results demonstrate that pressure-induced double-dome superconductivity is intrinsic to these V-based kagome superconductors, even in the absence of long-range CDW order.
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BibTeX
@misc{sun2026pressureinduced,
title = {{Pressure-induced double-dome superconductivity in doped kagome metal Cs(V0.86Ta0.14)3Sb5 without charge density wave}},
author = {Haochen Sun and Jing Wang and Deng Hu and Zhiwei Wang and Shiyan Li},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.12257},
eprint = {2610.12257},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.12257},
}
RIS
TY - UNPB
TI - Pressure-induced double-dome superconductivity in doped kagome metal Cs(V0.86Ta0.14)3Sb5 without charge density wave
AU - Haochen Sun
AU - Jing Wang
AU - Deng Hu
AU - Zhiwei Wang
AU - Shiyan Li
PY - 2026
DA - 2026/10/08
PB - arXiv
DO - 10.48550/arxiv.2610.12257
UR - https://arxiv.org/abs/2610.12257
AB - The vanadium-based kagome superconductor CsV_3Sb_5 exhibits an intricate interplay between charge density wave (CDW) and superconductivity (SC). Substituting Ta for V will suppress the CDW order and enhance superconductivity. Here, we report a high-pressure study up to 48 GPa on Ta-doped Cs(V_0.86Ta_0.14)_3Sb_5 with enhanced T_c around 5.29 K and without CDW order. At low pressures, unlike the characteristic ``M-shaped" temperature-pressure phase diagram of the pristine CsV_3Sb_5, the Ta-doped compound exhibits a distinct non-monotonic evolution. Initially, T_c drops slightly from 5.29 K at ambient pressure to 4.90 K at 0.33 GPa, before increasing to a maximum of 5.70 K at 0.61 GPa. Upon further compression, T_c decreases continuously to 0.98 K at 12.3 GPa. At higher pressures, T_c rises again, reaching 4.46 K at 47.7 GPa. This evolution of T_c establishes two superconducting domes under pressure, which are similar to those in CsV_3Sb_5. Our results demonstrate that pressure-induced double-dome superconductivity is intrinsic to these V-based kagome superconductors, even in the absence of long-range CDW order.
ER -