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A75s nuclear magnetic resonance study of antiferromagnetic fluctuations in the normal state of LiFeAs

P. Jeglič, A. Potočnik, M. Klanjšek, M. Bobnar, M. Jagodič, K. Koch, H. Rosner, S. Margadonna, B. Lv, A. M. Guloy, and D. Arčon
Phys. Rev. B 81, 140511(R) – Published 30 April 2010

Abstract

We present a detailed study of A75s nuclear magnetic resonance 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 A75s 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 A75s and L7i sites.

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  • Received 16 December 2009

DOI:https://doi.org/10.1103/PhysRevB.81.140511

©2010 American Physical Society

Authors & Affiliations

P. Jeglič1, A. Potočnik1, M. Klanjšek1, M. Bobnar1, M. Jagodič2, K. Koch3, H. Rosner3, S. Margadonna4, B. Lv5, A. M. Guloy5, and D. Arčon1,6

  • 1Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
  • 2Institute of Mathematics, Physics and Mechanics, Jadranska 19, 1000 Ljubljana, Slovenia
  • 3Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany
  • 4School of Chemistry, University of Edinburgh, West Mains Road, EH9 3JJ Edinburgh, United Kingdom
  • 5Department of Chemistry and TCSUH, University of Houston, Houston, Texas 77204-5002, USA
  • 6Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia

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Issue

Vol. 81, Iss. 14 — 1 April 2010

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