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
TL;DR
This study uses NMR techniques and density-functional calculations to reveal strong antiferromagnetic fluctuations in the normal state of LiFeAs, highlighting the nature of hyperfine interactions.
Contribution
It provides a detailed analysis of magnetic fluctuations in LiFeAs using NMR and theoretical calculations, clarifying the role of hyperfine coupling types.
Findings
Strong antiferromagnetic fluctuations suggested by Korringa relation analysis
Density-functional calculations match experimental electric field gradients
Hyperfine coupling type influences the fluctuation strength
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.
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