NMR and NQR studies on transition-metal arsenide superconductors LaRu2As2, KCa2Fe4As4F2, and A2Cr3As3
NMR and NQR studies on transition-metal arsenide superconductors LaRu2As2, KCa2Fe4As4F2, and A2Cr3As3
复制标题
过渡金属砷化物超导体 LaRu2As2、KCa2Fe4As4F2 和 A(2)Cr(3)As(3) 的 NMR 和 NQR 研究
DOI:
10.1088/1674-1056/ab892d
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发表时间:
2020-06-01
影响因子:
1.7
通讯作者:
Zheng, Guo-Qing
中科院分区:
文献类型:
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作者:
Luo, Jun;Wang, Chunguang;Zheng, Guo-Qing
We report As-75-nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements on transition-metal arsenides LaRu2As (2), KCa2Fe4As4F2, and A(2)Cr(3)As(3). In the superconducting state of LaRu2As2, a Hebel-Slichter coherence peak is found in the temperature dependence of the spin-lattice relaxation rate 1/T-1 just below T-c, which indicates that LaRu2As2 is a full-gap superperconducor. For KCa2Fe4As4F2, antiferromagnetic spin fluctuations are observed in the normal state. We further find that the anisotropy rate RAF=T1c/T1ab