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Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Wright, J.D., Pitcher, M.J. Trevelyan-Thomas, W., Lancaster, T., Baker, P.J. Pratt, F.L. Clarke, S.J. & Blundell, S.J. (2013). Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives. Physical Review B 88(6): 060401.

Author(s) from Durham

Abstract

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.