75As NQR and NMR studies of superconductivity and electron correlations in iron arsenide LiFeAs

Zheng Li; Yosuke Ooe; Xian Cheng Wang; Qing Qing Liu; Chang Qing Jin; Masanori Ichioka; Guo Qing Zheng

doi:10.1143/JPSJ.79.083702

⁷⁵As NQR and NMR studies of superconductivity and electron correlations in iron arsenide LiFeAs

Zheng Li, Yosuke Ooe, Xian Cheng Wang, Qing Qing Liu, Chang Qing Jin, Masanori Ichioka, Guo Qing Zheng

Research output: Contribution to journal › Article › peer-review

75 Citations (Scopus)

Abstract

We report the ⁷⁵As-NQR and NMR studies on the iron arsenide superconductor LiFeAs with T_c ∼ 17K. The spin lattice relaxation rate, 1/T₁, decreases below T_c without a coherence peak, and can be fitted by gaps with s^±-wave symmetry in the presence of impurity scattering. In the normal state, both 1/T₁T and the Knight shift decrease with decreasing temperature but become constant below T ≤ 50 K. Estimate of the Korringa ratio shows that the spin correlations are weaker than those in other families of iron arsenides, which may account for the lower T_c in this material.

Original language	English
Article number	083702
Journal	journal of the physical society of japan
Volume	79
Issue number	8
DOIs	https://doi.org/10.1143/JPSJ.79.083702
Publication status	Published - Aug 2010

Keywords

Iron arsenide
NMR
NQR
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.79.083702

Cite this

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title = "75As NQR and NMR studies of superconductivity and electron correlations in iron arsenide LiFeAs",

abstract = "We report the 75As-NQR and NMR studies on the iron arsenide superconductor LiFeAs with Tc ∼ 17K. The spin lattice relaxation rate, 1/T1, decreases below Tc without a coherence peak, and can be fitted by gaps with s±-wave symmetry in the presence of impurity scattering. In the normal state, both 1/T1T and the Knight shift decrease with decreasing temperature but become constant below T ≤ 50 K. Estimate of the Korringa ratio shows that the spin correlations are weaker than those in other families of iron arsenides, which may account for the lower Tc in this material.",

keywords = "Iron arsenide, NMR, NQR, Superconductivity",

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T1 - 75As NQR and NMR studies of superconductivity and electron correlations in iron arsenide LiFeAs

AU - Li, Zheng

AU - Ooe, Yosuke

AU - Wang, Xian Cheng

AU - Liu, Qing Qing

AU - Jin, Chang Qing

AU - Ichioka, Masanori

AU - Zheng, Guo Qing

PY - 2010/8

Y1 - 2010/8

N2 - We report the 75As-NQR and NMR studies on the iron arsenide superconductor LiFeAs with Tc ∼ 17K. The spin lattice relaxation rate, 1/T1, decreases below Tc without a coherence peak, and can be fitted by gaps with s±-wave symmetry in the presence of impurity scattering. In the normal state, both 1/T1T and the Knight shift decrease with decreasing temperature but become constant below T ≤ 50 K. Estimate of the Korringa ratio shows that the spin correlations are weaker than those in other families of iron arsenides, which may account for the lower Tc in this material.

AB - We report the 75As-NQR and NMR studies on the iron arsenide superconductor LiFeAs with Tc ∼ 17K. The spin lattice relaxation rate, 1/T1, decreases below Tc without a coherence peak, and can be fitted by gaps with s±-wave symmetry in the presence of impurity scattering. In the normal state, both 1/T1T and the Knight shift decrease with decreasing temperature but become constant below T ≤ 50 K. Estimate of the Korringa ratio shows that the spin correlations are weaker than those in other families of iron arsenides, which may account for the lower Tc in this material.

KW - Iron arsenide

KW - NMR

KW - NQR

KW - Superconductivity

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