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

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arxiv 0904.1571 v1 pith:SCOSP4M2 submitted 2009-04-09 cond-mat.supr-con cond-mat.str-el

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

classification cond-mat.supr-con cond-mat.str-el
keywords fluctuationsspinsuperconductorabovealonganisotropicanisotropyc-axis
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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