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Abstract：
The recently discovered kagome superconductors AV(3)Sb(5) exhibit tantalizing high-pressure phase diagrams, in which a new domelike superconducting phase emerges under moderate pressure. However, its origin is as yet unknown. Here, we carried out the high-pressure electrical measurements up to 150 GPa, together with the high-pressure x-ray diffraction measurements and first-principles calculations on CsV3Sb5. We find the new superconducting phase to be rather robust and inherently linked to the interlayer Sb2-Sb2 interactions. The formation of Sb2-Sb2 bonds at high pressure tunes the system from two-dimensional to three-dimensional and pushes the p(z) orbital of Sb2 upward across the Fermi level, resulting in enhanced density of states and increase of T-C. Our work demonstrates that the dimensional crossover at high pressure can induce a topological phase transition and is related to the abnormal high-pressure T-C evolution. Our findings should apply for other layered materials.
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PHYSICAL REVIEW LETTERS
ISSN： 0031-9007
Year： 2022
Issue： 7
Volume： 128
8 . 6
JCR@2022
8 . 1 0 0
JCR@2023
ESI Discipline： PHYSICS;
ESI HC Threshold：55
JCR Journal Grade：1
CAS Journal Grade：1
Cited Count：
SCOPUS Cited Count：
ESI Highly Cited Papers on the List： 0 Unfold All
WanFang Cited Count：
Chinese Cited Count：
30 Days PV： 1
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