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arXiv · 1605.01507

Observation of Ising spin-nematic order and its close relationship to the superconductivity in FeSe single crystals

Yuan Dongna·Yuan Jie·Huang Yulong·Ni Shunli·Feng Zhongpei·Zhou Huaxue·Mao Yiyuan·Jin Kui·Zhang Guangming·Dong Xiaoli·Zhou Fang·Zhao Zhongxian
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Abstract

Superconducting FeSe single crystals of (001) orientation are synthesized via a hydrothermal ion-release route. An Ising spin-nematic order is identified by our systematic measurements of in-plane angular-dependent magnetoresistance (AMR) and static magnetization. The turn-on temperature of anisotropic AMR signifies the Ising spin-nematic ordering temperature Tsn, below which a two-fold rotational symmetry is observed in the iron plane. A downward curvature appears below Tsn in the temperature dependence of static magnetization for the weak in-plane magnetic field as reported previously. Remarkably, we find a universal linear relationship between Tc and Tsn among various superconducting samples, indicating that the spin nematicity and the superconductivity in FeSe have a common microscopic origin.

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Yuan Dongna, Yuan Jie, Huang Yulong, Ni Shunli, Feng Zhongpei, Zhou Huaxue, Mao Yiyuan, Jin Kui, Zhang Guangming, Dong Xiaoli, Zhou Fang, Zhao Zhongxian. 2016-08-01. Observation of Ising spin-nematic order and its close relationship to the superconductivity in FeSe single crystals. https://doi.org/10.1103/physrevb.94.060506

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