NMR and NQR studies on transition-metal arsenide superconductors LaRu2As2, KCa2Fe4As4F2, and A 2Cr3As3

Jun Luo, Chunguang Wang, Chunguang Wang, Zhicheng Wang, Qi Guo, Ji Yang, Rui Zhou, Rui Zhou, K. Matano, T. Oguchi, Zhian Ren, Zhian Ren, Guanghan Cao, Guo Qing Zheng, Guo Qing Zheng, Guo Qing Zheng

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2 Citations (Scopus)

Abstract

We report 75As-nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements on transition-metal arsenides LaRu2As 2, KCa2Fe4As4F2, and A 2Cr3As3. 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 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 higherature superconductor with a stoichiometric composition. For A 2Cr3As3 (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.

Original languageEnglish
Article number067402
JournalChinese Physics B
Volume29
Issue number6
DOIs
Publication statusPublished - Jun 2020

Keywords

  • 3d and 4d orbitals
  • Transition-metal arsenides
  • iron-based superconductor
  • nuclear magnetic resonance

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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