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

Z. Li; J. Yang; Guo Qing Zheng

doi:10.1088/1742-6596/400/2/022145

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

Research output: Contribution to journal › Conference article

Abstract

We report on the pairing symmetry and the spin correlations in the Fe(Ni)-based superconductors RFe(Ni)AsO_1-xF_x (R=Pr, La), LiFeAs and Ba_1-xK_xFe₂As₂ single crystals, based on our extensive nuclear magnetic resonance and nuclear quadrupole resonance measurements. The spin susceptibility measured by the Knight shift decreases below T_c 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 language	English
Article number	022145
Journal	Journal of Physics: Conference Series
Volume	400
Issue number	PART 2
DOIs	https://doi.org/10.1088/1742-6596/400/2/022145
Publication status	Published - Jan 1 2012
Event	26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China Duration: Aug 10 2011 → Aug 17 2011

ASJC Scopus subject areas

Physics and Astronomy(all)

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Li, Z., Yang, J., & Zheng, G. Q. (2012). Spin-orbit coupling, anisotropic magnetic fluctuations and nodeless energy gap in iron-pnictides revealed by NMR. Journal of Physics: Conference Series, 400(PART 2), [022145]. https://doi.org/10.1088/1742-6596/400/2/022145

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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.",

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