NMR evidence of strong-correlated superconductivity in LiFeAs: tuning toward an SDW ordering

Details NMR evidence of strong-correlated superconductivity in LiFeAs: tuning toward an SDW ordering NMR evidence of strong-correlated superconductivity in LiFeAs: tuning toward an SDW ordering

2010-08-31

arxiv.org/abs/1008.5199v1

Phys. Rev. B 82, 180501(R) (2010)

Physics

Condensed Matter

Superconductivity

5 pages, s figures

Scientific paper

In this letter, we reported the results of NMR study on LiFeAs single crystals. We find a strong evidence of the low temperature spin fluctuations; by changing sample preparation conditions, the system can be tuned toward an spin-density-wave (SDW) quantum-critical point. The detection of an interstitial Li(2) ion, possibly locating in the tetrahedral hole, suggests that the off-stoichiometry and/or lattice defect can probably account for the absence of the SDW ordering in LiFeAs. These facts show that LiFeAs is a strongly correlated system and the superconductivity is likely originated from the SDW fluctuations.

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