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Chin. Phys. B, 2020, Vol. 29(6): 067402    DOI: 10.1088/1674-1056/ab892d

NMR and NQR studies on transition-metal arsenide superconductors LaRu2As2, KCa2Fe4As4F2, and A2Cr3As3

Jun Luo(罗军)1, Chunguang Wang(王春光) Zhicheng Wang(王志成)1,2, Qi Guo(郭琦)3, Jie Yang(杨杰)1, Rui Zhou(周睿)1, K Matano1,4, T Oguchi5, Zhian Ren(任治安)6, Guanghan Cao(曹光旱)1,2, Guo-Qing Zheng(郑国庆)3
1 Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Department of Physics, Zhejiang University, Hangzhou 310027, China;
4 Songshan Lake Materials Laboratory, Dongguan 523808, China;
5 Department of Physics, Okayama University, Okayama 700-8530, Japan;
6 Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
Abstract  We report 75As-nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements on transition-metal arsenides LaRu2As2, KCa2Fe4As4F2, and A2Cr3As3. In the superconducting state of LaRu2As2, a Hebel-Slichter coherence peak is found in the temperature dependence of the spin-lattice relaxation rate 1/T1 just below Tc, 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 is small and temperature independent, implying that the low energy spin fluctuations are isotropic in spin space. Our results indicate that KCa2Fe4As4F2 is a moderately overdoped iron-arsenide high-temperature superconductor with a stoichiometric composition. For A2Cr3As3 (A=Na, K, Rb, Cs), we calculate the electric field gradient by first-principle method and assign the 75As-NQR peaks to two crystallographically different As sites, paving the way for further NMR investigation.
Keywords:  transition-metal arsenides      3d and 4d orbitals      nuclear magnetic resonance      iron-based superconductor  
Received:  03 March 2020      Revised:  07 April 2020      Accepted manuscript online: 
PACS:  74.25.nj (Nuclear magnetic resonance)  
  74.40.-n (Fluctuation phenomena)  
  74.25.Dw (Superconductivity phase diagrams)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11674377, 11634015, and 11974405), the National Key R&D Program of China (Grant Nos. 2017YFA0302904 and 2016YFA0300502), and J. Y. also acknowledges support by the Youth Innovation Promotion Association of Chinese Academy of Sciences.
Corresponding Authors:  Jun Luo, Guo-Qing Zheng     E-mail:;

Cite this article: 

Jun Luo(罗军), Chunguang Wang(王春光) Zhicheng Wang(王志成), Qi Guo(郭琦), Jie Yang(杨杰), Rui Zhou(周睿), K Matano, T Oguchi, Zhian Ren(任治安), Guanghan Cao(曹光旱), Guo-Qing Zheng(郑国庆) NMR and NQR studies on transition-metal arsenide superconductors LaRu2As2, KCa2Fe4As4F2, and A2Cr3As3 2020 Chin. Phys. B 29 067402

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