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 journalArticle

68 Citations (Scopus)

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.

Original languageEnglish
Article number083702
JournalJournal of the Physical Society of Japan
Volume79
Issue number8
DOIs
Publication statusPublished - Aug 2010

Fingerprint

superconductivity
arsenides
iron
nuclear magnetic resonance
spin-lattice relaxation
electrons
impurities
symmetry
estimates
scattering
temperature

Keywords

  • Iron arsenide
  • NMR
  • NQR
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

75As NQR and NMR studies of superconductivity and electron correlations in iron arsenide LiFeAs. / Li, Zheng; Ooe, Yosuke; Wang, Xian Cheng; Liu, Qing Qing; Jin, Chang Qing; Ichioka, Masanori; Zheng, Guo-Qing.

In: Journal of the Physical Society of Japan, Vol. 79, No. 8, 083702, 08.2010.

Research output: Contribution to journalArticle

@article{9fec7dab2c4e42ef861b42d2278181e3,
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",
author = "Zheng Li and Yosuke Ooe and Wang, {Xian Cheng} and Liu, {Qing Qing} and Jin, {Chang Qing} and Masanori Ichioka and Guo-Qing Zheng",
year = "2010",
month = "8",
doi = "10.1143/JPSJ.79.083702",
language = "English",
volume = "79",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "8",

}

TY - JOUR

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

UR - http://www.scopus.com/inward/record.url?scp=77956316032&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77956316032&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.79.083702

DO - 10.1143/JPSJ.79.083702

M3 - Article

AN - SCOPUS:77956316032

VL - 79

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 8

M1 - 083702

ER -