Growth and superconducting properties of F-substituted ROBiS2 (R=La, Ce, Nd) single crystals
Growth and superconducting properties of F-substituted ROBiS2 (R=La, Ce, Nd) single crystals
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DOI：
10.1016/j.ssc.2013.10.019
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发表时间：
2014-01-01
影响因子：
2.1
通讯作者：
Tanaka, Isao
中科院分区：
文献类型：
--
作者：
Nagao, Masanori;Miura, Akira;Tanaka, Isao
用CsCl/KCl助熔剂成功地生长了不同F浓度的掺F ROBiS_2（R=La，Ce，Nd）超导单晶。所产生的所有晶体具有板状形状，具有尺寸为1-2 mm的发育良好的ab平面。电子探针微量分析没有检测到任何Cs，K，或Cl通量的晶体成分。生长的单晶体的F-取代LaOBiS 2和CeOBiS 2表现出超导电性在约3 K，而F-取代NdOBiS 2的超导性在约5 K。根据有效质量模型，F取代LaOBiS 2和NdOBiS 2单晶的超导各向异性为30-45，而F取代CeOBiS 2单晶的各向异性为13-21。F-取代的CeOBiS 2单晶在7 K附近表现出磁性有序，在低于约3 K时明显与超导性共存。(C)2013爱思唯尔有限公司保留所有权利。
F-substituted ROBiS2 (R=La, Ce, Nd) superconducting single crystals with different F concentrations were grown successfully using a CsCl/KCl flux. All crystals produced had a plate-like shape, with a well-developed ab-plane 1-2 mm in size. Electron probe microanalysis did not detect any Cs, K, or Cl flux components in the crystals. As-grown single crystals of F-substituted LaOBiS2 and CeOBiS2 exhibited superconductivity at about 3 K, whereas F-substituted NdOBiS2 was superconductive at approximately 5 K. The superconducting anisotropy of single crystal F-substituted LaOBiS2 and NdOBiS2 was estimated to be 30-45 according to the effective mass model, whereas the anisotropy for F-substituted CeOBiS2 single crystals was 13-21. The F-substituted CeOBiS2 single crystals exhibited a magnetic order around 7 K that apparently coexisted with superconductivity below approximately 3 K. (C) 2013 Elsevier Ltd. All rights reserved.