Journal
PHYSICAL REVIEW B
Volume 81, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.140511
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Funding
- Slovenian Research Agency
- NSF [CHE-0616805]
- R.A. Welch Foundation [E-1297]
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We present a detailed study of As-75 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 As-75 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 As-75 and Li-7 sites.
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