Antiferromagnetic fluctuations in the normal state of LiFeAs

P. Jeglic; A. Potocnik; M. Klanjsek; M. Bobnar; M. Jagodic; K. Koch; H. Rosner; S. Margadonna; B. Lv; A. M. Guloy; D. Arcon

doi:10.1103/PhysRevB.81.140511

Antiferromagnetic fluctuations in the normal state of LiFeAs

Superconductivity 2010-05-03 v2 Strongly Correlated Electrons

Authors: P. Jeglic , A. Potocnik , M. Klanjsek , M. Bobnar , M. Jagodic , K. Koch , H. Rosner , S. Margadonna , B. Lv , A. M. Guloy , D. Arcon

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Abstract

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.

Keywords

antiferromagnetic fluctuations NMR Knight shift spin-lattice relaxation rate LiFeAs hyperfine coupling

Cite

@article{arxiv.0912.0692,
  title  = {Antiferromagnetic fluctuations in the normal state of LiFeAs},
  author = {P. Jeglic and A. Potocnik and M. Klanjsek and M. Bobnar and M. Jagodic and K. Koch and H. Rosner and S. Margadonna and B. Lv and A. M. Guloy and D. Arcon},
  journal= {arXiv preprint arXiv:0912.0692},
  year   = {2010}
}

Comments

5 pages, 3 figures, thoroughly revised version with refined experimental data, accepted for publication as a Rapid Communication in Physical Review B.

Antiferromagnetic fluctuations in the normal state of LiFeAs

Abstract

Keywords

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