Unusual Normal and Superconducting State Properties Observed in Hydrothermal Fe$_{1-\delta}$Se Flakes

doi:10.1088/0256-307X/38/5/057401

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Abstract：The electronic and superconducting properties of Fe$_{1-\delta}$Se single-crystal flakes grown hydrothermally are studied by the transport measurements under zero and high magnetic fields up to 38.5 T. The results contrast sharply with those previously reported for nematically ordered FeSe by chemical-vapor-transport (CVT) growth. No signature of the electronic nematicity, but an evident metal-to-nonmetal crossover with increasing temperature, is detected in the normal state of the present hydrothermal samples. Interestingly, a higher superconducting critical temperature $T_{\rm c}$ of 13.2 K is observed compared to a suppressed $T_{\rm c}$ of 9 K in the presence of the nematicity in the CVT FeSe. Moreover, the upper critical field in the zero-temperature limit is found to be isotropic with respect to the field direction and to reach a higher value of $\sim $42 T, which breaks the Pauli limit by a factor of 1.8.

收稿日期: 2021-03-22 出版日期: 2021-04-21

:	74.70.Xa	(Pnictides and chalcogenides)
	74.25.Op	(Mixed states, critical fields, and surface sheaths)
	74.25.F-	(Transport properties)
	81.20.-n	(Methods of materials synthesis and materials processing)

引用本文:

. [J]. 中国物理快报, 2021, 38(5): 57401-057401.
Shaobo Liu, Sheng Ma, Zhaosheng Wang, Wei Hu, Zian Li, Qimei Liang, Hong Wang, Yuhang Zhang, Zouyouwei Lu, Jie Yuan, Kui Jin, Jian-Qi Li, Li Pi, Li Yu, Fang Zhou, Xiaoli Dong, and Zhongxian Zhao. Unusual Normal and Superconducting State Properties Observed in Hydrothermal Fe$_{1-\delta}$Se Flakes. Chin. Phys. Lett., 2021, 38(5): 57401-057401.

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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/38/5/057401 或 https://cpl.iphy.ac.cn/CN/Y2021/V38/I5/57401

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