量子相位转换作为增强卡戈梅超导体CsV3Sb5中的关键电流的有希望的途径
Wenyan Wang1, Lingfei Wang1, Xinyou Liu1
1Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 16, 2024
概括
研究人员通过调整量子相位过渡与压力来增强CsV3Sb5超导体中的临界电流. 在量子临界点处临界电流的峰值表明增强的量子波动.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 量子材料是一种量子材料.
背景情况:
- 超导是一种在临界温度以下电阻为零的状态.
- 临界电流 (Ic) 是一个关键参数,决定了超导体的电流承载能力.
- 像CsV3Sb5这样的Kagome超导体表现出复杂的电子相,包括电荷密度波 (CDW) 和超导,对压力等外部刺激敏感.
研究的目的:
- 为了研究水静压对卡戈姆超导体CsV3Sb5.5.的临界电流的影响.
- 探索充电密度波 (CDW) 阶段过渡和超导性增强之间的关系.
- 为了确定量子相位转换及其对超导特性的影响.
主要方法:
- 在CsV3Sb5样本上施加水静压.
- 测量自场临界电流 (Ic, sf) 作为压力的函数.
- 分析Ic,sf在零温度极限 (Ic,sf(0) 的行为.
- 关联关键电流增强与抑制CDW阶段.
主要成果:
- 发现水静压可以抑制CsV3Sb5.5中的电荷密度波 (CDW) 阶段.
- 随着CDW阶段的抑制,观察到自场关键电流 (Ic, sf) 的显著增强.
- 在Ic,sf(0) 中的峰值增强记录在约20 kbar,与CDW阶段过渡的消失相吻合.
- 这种由压力引起的异常表明,这种材料中存在零温度量子异常.
结论:
- CsV3Sb5的临界电流可以通过利用水静压诱导的量子相位过渡来系统地增强.
- 在量子临界点观察到的临界电流峰值为与CDW阶段相关的增强量子波动提供了有力的证据.
- 这些发现突出了量子关键性在设计和优化超导材料的技术应用中的潜力.
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