期刊
PHYSICAL REVIEW B
卷 106, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.184503
关键词
-
资金
- Japan Society for the Promotion of Science KAKENHI
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- [19H01842]
- [19H05825]
- [19H05819]
- [22H04485]
- [22K03537]
- [2015187]
In this study, the electronic anisotropy of CaFeAsF was investigated by measuring its resistivity under magnetic fields with varying field directions. The results reveal the presence of electron anisotropy in iron-based compounds and provide insights into the nematic electronic state in various materials.
Both cuprates and iron-based superconductors demonstrate nematicity, defined as the spontaneous breaking of rotational symmetry in electron systems. The nematic state can play a role in the high-transition-temperature superconductivity of these compounds. However, the microscopic mechanism responsible for the transport anisotropy in iron-based compounds remains debatable. Here, we investigate the electronic anisotropy of CaFeAsF by measuring its interlayer resistivity under magnetic fields with varying field directions. Counter -intuitively, the interlayer resistivity was larger in the longitudinal configuration (B II I II c) than in the transverse one (B 1 I II c). The interlayer resistivity exhibited a so-called coherence peak under in-plane fields and was highly anisotropic with respect to the in-plane field direction. At T = 4 K and B = 14 T, the magnetoresistance AP/P0 was seven times larger in the B II bo than in the B II ao configuration. Our theoretical calculations of the conductivity based on the first-principles electronic band structure qualitatively reproduced the above observations but underestimated the magnitudes of the observed features. The proposed methodology can be a powerful tool for probing the nematic electronic state in various materials.
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