Quantum Phase Transition as a Promising Route to Enhance the Critical Current in Kagome Superconductor CsV3Sb5

被引:0
作者
Wang, Wenyan [1 ]
Wang, Lingfei [1 ]
Liu, Xinyou [1 ]
Tsang, Chun Wai [1 ]
Wang, Zheyu [1 ]
Poon, Tsz Fung [1 ]
Wang, Shanmin [2 ]
Lai, Kwing To [1 ]
Zhang, Wei [1 ]
Tallon, Jeffery L. [3 ]
Goh, Swee K. [1 ]
机构
[1] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
[2] Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
[3] Victoria Univ Wellington, Robinson Inst, Wellington 6140, New Zealand
基金
中国国家自然科学基金;
关键词
critical current; high-pressure; kagome superconductors; quantum phase transition; CHARGE-DENSITY-WAVE; CRITICAL-POINT; METAL CSV3SB5; ORDER; PEAK;
D O I
10.1002/advs.202410099
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Developing strategies to systematically increase the critical current, the threshold current below which the superconductivity exists, is an important goal of materials science. Here, the concept of quantum phase transition is employed to enhance the critical current of a kagome superconductor CsV3Sb5, which exhibits a charge density wave (CDW) and superconductivity that are both affected by hydrostatic pressure. As the CDW phase is rapidly suppressed under pressure, a large enhancement in the self-field critical current (I-c,I-sf) is recorded. The observation of a peak-like enhancement of I-c,I-sf at the zero-temperature limit (I-c,I-sf(0)) centered at p*approximate to 20 kbar, the same pressure where the CDW phase transition vanishes, further provides strong evidence of a zero-temperature quantum anomaly in this class of pressure-tuned superconductor. Such a peak in I-c,I-sf(0) resembles the findings in other well-established quantum-critical superconductors, hinting at the presence of enhanced quantum fluctuations associated with the CDW phase in CsV3Sb5.
引用
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页数:7
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