NMR measurements of intrinsic spin susceptibility in LaFeAsO(0.9)F(0.1)

Details NMR measurements of intrinsic spin susceptibility in LaFeAsO(0.9)F(0.1) NMR measurements of intrinsic spin susceptibility in LaFeAsO(0.9)F(0.1)

2008-10-01

arxiv.org/abs/0810.0305v1

J. Phys. Soc. Jpn. 77 (2008) Supplement C pp.47-53

Physics

Condensed Matter

Superconductivity

Invited paper to the Proceedings of the International Symposium on Iron-oxypnictide Superconductors (June 28-29, 2008, Tokyo).

Scientific paper

We will probe the intrinsic behavior of spin susceptibility chi_(spin) in the LaFeAsO(1-x)F(x) superconductor (x ~ 0.1, Tc ~ 27K) using 19-F and 75-As NMR techniques. Our new results firmly establish the pseudo-gap behavior with Delta_(PG)/kB ~ 140K. The estimated magnitude of chi_(spin) at 290K, ~1.8x10^(-4) [emu/mol-Fe], is approximately twice larger than that in high Tc cuprates. We also show that chi_(spin) levels off below ~50K down to Tc.

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