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

doi:10.1088/1674-1056/ab892d

中国物理B ›› 2020, Vol. 29 ›› Issue (6): 67402-067402.doi: 10.1088/1674-1056/ab892d

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

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)

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

收稿日期:2020-03-03 修回日期:2020-04-07 出版日期:2020-06-05 发布日期:2020-06-05
通讯作者: Jun Luo, Guo-Qing Zheng E-mail:junluo@iphy.ac.cn;gqzheng123@gmail.com
基金资助:
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.

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 Matano^1,4, 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

Received:2020-03-03 Revised:2020-04-07 Online:2020-06-05 Published:2020-06-05
Contact: Jun Luo, Guo-Qing Zheng E-mail:junluo@iphy.ac.cn;gqzheng123@gmail.com
Supported by:
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.

摘要/Abstract

摘要： 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 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 R_AF=T₁^c/T₁^ab 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.

关键词: transition-metal arsenides, 3d and 4d orbitals, nuclear magnetic resonance, iron-based superconductor

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 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 R_AF=T₁^c/T₁^ab 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.

Key words: transition-metal arsenides, 3d and 4d orbitals, nuclear magnetic resonance, iron-based superconductor

中图分类号: (Nuclear magnetic resonance)

74.25.nj

74.40.-n (Fluctuation phenomena) 74.25.Dw (Superconductivity phase diagrams)

罗军, 王春光, 王志成, 郭琦, 杨杰, 周睿, K Matano, T Oguchi, 任治安, 曹光旱, 郑国庆. NMR and NQR studies on transition-metal arsenide superconductors LaRu₂As₂, KCa₂Fe₄As₄F₂, and A₂Cr₃As₃[J]. 中国物理B, 2020, 29(6): 67402-067402.

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[J]. Chin. Phys. B, 2020, 29(6): 67402-067402.

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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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