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
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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
期刊:
影响因子:
1.7
通讯作者:
Zheng, Guo-Qing
Zheng, Guo-Qing
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Luo, Jun;Wang, Chunguang;Zheng, Guo-Qing

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本文报道了过渡金属砷化物LaRu_2As(2)、KCa_2Fe_4As_4F_2和A(2)Cr(3)As(3)的As-75核磁共振(NMR)和核四极共振(NQR)测量结果。在LaRu_2As_2超导态下,自旋-晶格弛豫速率1/T ~(-1)的温度依赖性在Tc以下出现了一个Hebel-Slichter相干峰,表明LaRu_2As_2是一个全带隙超导体。对于KCa_2Fe_4As_4F_2,在正常态下观察到反铁磁自旋涨落。我们进一步发现,各向异性率RAF= T1 c/T1 ab
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