在量子关键超导体CeRhIn5中证据表明电荷移位交叉
Honghong Wang1,2, Tae Beom Park1,2,3, Jihyun Kim1,2
1Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University, Suwon, South Korea.
Nature communications
|November 13, 2023
概括
研究人员研究了在磁量子临界点 (QCP) 附近的重子系统. 他们发现了康多效应.
科学领域:
- 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.
- 强相关的电子系统 强相关的电子系统
背景情况:
- 重费米子系统表现出接近绝对零的复杂磁性行为.
- 了解电子定位和移位之间的相互作用是量子关键性的关键.
- 康多效应在重子系统属性中起着至关重要的作用.
研究的目的:
- 在重子系统中研究f电子相对于磁量子临界点 (QCP) 的自由度的移位.
- 为了实验性地确定有限温度尺度Eloc,信号交叉从局部到非局部的f电子字符.
- 要区分Kondo分解的关键性和旋转密度波 (SDW) 的关键性.
主要方法:
- 利用压力依赖的霍尔测量来探测电子属性.
- 分析有限温度尺度Eloc作为压力的函数的行为.
- 将原始CeRhIn5中的Eloc(P) 行为与Sn-doped CeRhIn5进行比较.
主要成果:
- 在CeRhIn5中,Eloc(P) 在反铁磁QCP上推断为零,表明Kondo分解的关键性与相关的磁性和电荷波动.
- 在4.4%的Sn-doped CeRhIn5中,Eloc(P) 推断到磁性排序相中,与QCP脱,表明只有SDW顺序参数波动的SDW关键性.
- 两种材料的超导性在各自的磁性QCP时达到最大临界温度 (Tc).
结论:
- 通过实验确定Eloc对于表征量子关键性至关重要.
- 关键性的性质 (Kondo-breakdown与SDW) 显著影响了相关的波动.
- 了解这些关键波动对于阐明重子化合物中的超导机制至关重要.
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