Publication details for Professor Tom LancasterWright, 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.
- Publication type: Journal Article
- ISSN/ISBN: 1098-0121 (print), 1550-235X (electronic)
- DOI: 10.1103/PhysRevB.88.060401
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
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.