Spin-orbit coupling, anisotropic magnetic fluctuations and nodeless energy gap in iron-pnictides revealed by NMR

Z. Li, J. Yang, Guo Qing Zheng

Research output: Contribution to journalConference article

Abstract

We report on the pairing symmetry and the spin correlations in the Fe(Ni)-based superconductors RFe(Ni)AsO1-xFx (R=Pr, La), LiFeAs and Ba1-xKxFe2As2 single crystals, based on our extensive nuclear magnetic resonance and nuclear quadrupole resonance measurements. The spin susceptibility measured by the Knight shift decreases below Tc along all crystal directions, which indicates spin-singlet pairing. Evidence for multiple gaps is given. We find that the antiferromagnetic spin fluctuation is anisotropic in the spin space due to spin-orbit coupling, but becomes isotropic in the zero temperature limit, which points to spin-singlet superconductivity with nodeless gap.

Original languageEnglish
Article number022145
JournalJournal of Physics: Conference Series
Volume400
Issue numberPART 2
DOIs
Publication statusPublished - Jan 1 2012
Event26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China
Duration: Aug 10 2011Aug 17 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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