Nematicity and in-plane anisotropy of superconductivity in β-FeSe detected by 77Se nuclear magnetic resonance

被引：26

作者：

Baek, S. -H. ^{[1
]}

Efremov, D. V. ^{[1
]}

Ok, J. M. ^{[2
]}

Kim, J. S. ^{[2
]}

van den Brink, Jeroen ^{[1
,3
]}

Buechner, B. ^{[1
,3
]}

机构：

[1] IFW Dresden, Helmholtzstr 20, D-01069 Dresden, Germany

[2] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea

[3] Tech Univ Dresden, Dept Phys, D-01062 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 18期

关键词：

PHASE-DIAGRAM; SPIN; FLUCTUATIONS; TRANSITION; INTERPLAY; SYMMETRY; STATE;

D O I：

10.1103/PhysRevB.93.180502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The recent study of Se-77 nuclear magnetic resonance (NMR) in a beta-FeSe single crystal proposed that ferro-orbital order breaks the 90 degrees C-4 rotational symmetry, driving nematic ordering. Here, we report an NMR study of the impact of small strains generated by gluing on nematic state and spin fluctuations. We observe that the local strains strongly affect the nematic transition, considerably enhancing its onset temperature. On the contrary, no effect on low-energy spin fluctuations was found. Furthermore we investigate the interplay of the nematic phase and superconductivity. Our study demonstrates that the twinned nematic domains respond unequivalently to superconductivity, evidencing the twofold C-2 symmetry of superconductivity in this material. The obtained results are well understood in terms of the proposed ferro-orbital order.

引用

页数：6

共 43 条

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