The upper critical field in the BiCh2-based superconductors CeOBiS1.7Se0.3 and PrO0.5F0.5BiS2-xSex (x = 0, 0.3)
The upper critical field in the BiCh2-based superconductors CeOBiS1.7Se0.3 and PrO0.5F0.5BiS2-xSex (x = 0, 0.3)
复制标题
BiCh2基超导体CeOBiS1.7Se0.3和PrO0.5F0.5BiS2-xSex (x = 0, 0.3)的上临界场
DOI：
10.1088/2399-6528/ac6d44
复制
发表时间：
2022
影响因子：
1.2
通讯作者：
Mizuguchi Yoshikazu
中科院分区：
文献类型：
--
作者：
Kiyama Ryosuke;Hoshi Kazuhisa;Goto Yosuke;Nagao Masanori;Mizuguchi Yoshikazu
报道了BiCl 2基超导体CeOBiS1.7Se0.3和PrO0.5F0.5BiS2-xSex（x= 0，0.3）的上临界场（B c2）.用助熔剂法生长了CeOBiS1.7Se0.3和PrO0.5F0.5BiS2-xSex（x= 0，0.3）单晶.单晶结构分析表明，室温下的晶体结构为四氢呋喃（P4/nmm）。通过电阻率和磁化强度测量，在所有样品中观察到体超导性。对于CeOBiS 1.7 Se 0.3，面内B c2小于常规轨道极限和泡利极限，表明在相关的含Ce BiCl 2基化合物中观察到的铁磁有序影响B c2和超导电性.与此相反，高面内B c2观察到的PrO 0.5 F 0.5 BiS 2-x Se x（x= 0，0.3）。我们认为面内B c2是由反对称自旋轨道耦合增强的，这是由于缺乏局域反转对称性引起的。
We report the upper critical field (B c2) in the BiCh 2-based superconductors CeOBiS 1.7 Se 0.3 and PrO 0.5 F 0.5 BiS 2-x Se x (x= 0, 0.3). Single crystals of CeOBiS 1.7 Se 0.3 and PrO 0.5 F 0.5 BiS 2-x Se x (x= 0, 0.3) were grown using the flux method. Single-crystal structural analysis revealed that the crystal structure at room temperature is tetragonal (P4/nmm). Through electrical resistivity and magnetization measurements, bulk superconductivity was observed in all samples. For CeOBiS 1.7 Se 0.3, the in-plane B c2 is smaller than the conventional orbital limit and Pauli limit, suggesting that ferromagnetic ordering, which has been observed in a related Ce-containing BiCh 2-based compound, affects B c2 and superconductivity. In contrast, high in-plane B c2 was observed for PrO 0.5 F 0.5 BiS 2-x Se x (x= 0, 0.3). We propose that the in-plane B c2 is enhanced by antisymmetric spin–orbit coupling, which arises from the lack of local inversion symmetry.