75As NMR studies of superconducting LaFeAsO0.9F0.1

Grafe, H.-J. and Paar, Dalibor and Lang, G. and Curro, N. J. and Behr, G. and Werner, J. and Hamann-Borrero, J. and Hess, C. and Leps, N. and Klingeler, R. and Buchner, B. (2008) 75As NMR studies of superconducting LaFeAsO0.9F0.1. Physical Review Letters, 101 (4). pp. 47003-4. ISSN 0031-9007

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We have performed 75As nuclear magnetic resonance measurements on aligned powders of the new LaFeAsO0:9F0:1 superconductor. In the normal state, we find a strong temperature dependence of the spin shift and Korringa behavior of the spin lattice relaxation rate. In the superconducting state, we find evidence for line nodes in the superconducting gap and spin-singlet pairing. Our measurements reveal a strong anisotropy of the spin lattice relaxation rate, which suggests that superconducting vortices contribute to the relaxation rate when the field is parallel to the c axis but not for the perpendicular direction.

Item Type: Article
Keywords: superconducting materials, nuclear magnetic resonance and relaxation
Date: July 2008
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2008) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1022
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 03 Jun 2014 11:41
Last Modified: 03 Jun 2014 11:41
URI: http://digre.pmf.unizg.hr/id/eprint/1823

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