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Antiferromagnetic fluctuations in the normal state of LiFeAs

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arxiv 0912.0692 v2 pith:4TTU4P2J submitted 2009-12-03 cond-mat.supr-con cond-mat.str-el

Antiferromagnetic fluctuations in the normal state of LiFeAs

P. Jeglic , A. Potocnik , M. Klanjsek , M. Bobnar , M. Jagodic , K. Koch , H. Rosner , S. Margadonna
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B. Lv A. M. Guloy D. Arcon
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classification cond-mat.supr-con cond-mat.str-el
keywords lifeasantiferromagneticcouplingexperimentalfluctuationshyperfinenormalstate
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We present a detailed study of 75As NMR Knight shift and spin-lattice relaxation rate in the normal state of stoichiometric polycrystalline LiFeAs. Our analysis of the Korringa relation suggests that LiFeAs exhibits strong antiferromagnetic fluctuations, if transferred hyperfine coupling is a dominant interaction between 75As nuclei and Fe electronic spins, whereas for an on-site hyperfine coupling scenario, these are weaker, but still present to account for our experimental observations. Density-functional calculations of electric field gradient correctly reproduce the experimental values for both 75As and 7Li sites.

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