75As NMR Observation of Anisotropic Spin Fluctuations in the Ba[(Fe0.92Co0.08)2]2As2 Superconductor (Tc = 22 K)

Details 75As NMR Observation of Anisotropic Spin Fluctuations in the Ba[(Fe0.92Co0.08)2]2As2 Superconductor (Tc = 22 K) 75As NMR Observation of Anisotropic Spin Fluctuations in the Ba[(Fe0.92Co0.08)2]2As2 Superconductor (Tc = 22 K)

2009-04-09

arxiv.org/abs/0904.1571v1

Physics

Condensed Matter

Superconductivity

2 Figures

Scientific paper

We demonstrate that the anisotropy R of the paramagnetic spin fluctuations
grows toward Tc at 75As sites in the optimally electron-doped superconductor
Ba[(Fe0.92Co0.08)2]2As2, with stronger spin fluctuations along the c-axis. Our
finding is in remarkable contrast with the case of high T$_c$ cuprates, where R
is independent of temperature above Tc.

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