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Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives.

Wright, J.D. and Pitcher, M.J. and Trevelyan-Thomas, W. and Lancaster, T. and Baker, P.J. and Pratt, F.L. and Clarke, S.J. and Blundell, S.J. (2013) 'Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives.', Physical review B., 88 (6). 060401.


We present detailed magnetometry and muon-spin rotation data on polycrystalline samples of overdoped, nonsuperconducting LiFe1−xNixAs (x = 0.1,0.2) and Li1−yFe1+yAs (0 y 0.04) as well as superconducting LiFeAs.While LiFe1−xNixAs exhibits weak antiferromagnetic fluctuations down to 1.5 K,Li1−yFe1+yAs samples, which have a much smaller deviation from the 1 : 1 : 1 stoichiometry, show a crossover from ferromagnetic to antiferromagnetic fluctuations on cooling and a freezing of dynamically fluctuating moments at low temperatures. We do not find any signatures of time-reversal symmetry breaking in stoichiometric LiFeAs that would support recent predictions of triplet pairing.

Item Type:Article
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Publisher statement:© 2013 American Physical Society
Date accepted:No date available
Date deposited:17 January 2014
Date of first online publication:August 2013
Date first made open access:No date available

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