$^{75}$As NMR studies of superconducting LaO$_{0.9}$F$_{0.1}$FeAs

Details $^{75}$As NMR studies of superconducting LaO$_{0.9}$F$_{0.1}$FeAs $^{75}$As NMR studies of superconducting LaO$_{0.9}$F$_{0.1}$FeAs

2008-05-16

arxiv.org/abs/0805.2595v3

Phys. Rev. Lett. 101, 047003 (2008)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.101.047003

We have performed 75As Nuclear Magnetic Resonance (NMR) measurements on aligned powders of the new LaO0.9F0.1FeAs 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 suggest that superconducting vortices contribute to the relaxation rate when the field is parallel to the c-axis but not for the perpendicular direction.

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