摘要
The electronic and superconducting properties of Fe_(1-δ)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 Fe Se 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_c of 13.2 K is observed compared to a suppressed T_c of 9 K in the presence of the nematicity in the CVT Fe Se.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-42 T,which breaks the Pauli limit by a factor of 1.8.
作者
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
Zhongxian Zhao
刘少博;马晟;王钊胜;胡卫;李子安;梁起美;王鸿;张宇航;鲁邹有为;袁洁;金魁;李建奇;皮雳;俞理;周放;董晓莉;赵忠贤(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory of the Chinese Academy of Sciences,Hefei 230031,China;Key Laboratory for Vacuum Physics,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)
基金
Supported by the National Key Research and Development Program of China (Grant Nos.2016YFA0300300 and 2017YFA0303003)
the National Natural Science Foundation of China (Grant Nos.12061131005,11834016 and 11888101)
the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No.XDB25000000)
the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant Nos.QYZDY-SSW-SLH001)。
