Ferromagnetic spin fluctuation in LaFeAsO1-xFx

Details Ferromagnetic spin fluctuation in LaFeAsO1-xFx Ferromagnetic spin fluctuation in LaFeAsO1-xFx

2008-06-20

arxiv.org/abs/0806.3304v1

Phys. Rev. B 78, 020512(R) (2008)

Physics

Condensed Matter

Superconductivity

13 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.020512

The F doped LaFeAsO, a recently discovered superconductor with the high Tc of 26 K, has been studied by the resistivity, magnetic susceptibility, and heat capacity measurements in the F doping range from 0 to 0.14 (x in LaFeAsO1-xFx). In the low temperature region, a T3lnT term in the heat capacity and a T2 term in the magnetic susceptibility, which are derived from the spin fluctuation, are observed. The nearly ferromagnetic nature evidenced by a large Wilson ratio (6.5 for x = 0, and 11.2 for x = 0.025) suggests that the superconductivity in the LaFeAsO system is mediated by ferromagnetic spin fluctuation.

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