Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives

Wright, J.D.; Pitcher, M.J.; Trevelyan-Thomas, W.; Lancaster, T.; Baker, P.J.; Pratt, F.L.; Clarke, S.J.; Blundell, S.J.

doi:10.1103/physrevb.88.060401

Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives

Wright, J.D.; Pitcher, M.J.; Trevelyan-Thomas, W.; Lancaster, T.; Baker, P.J.; Pratt, F.L.; Clarke, S.J.; Blundell, S.J.

Authors

J.D. Wright

M.J. Pitcher

W. Trevelyan-Thomas

Professor Tom Lancaster tom.lancaster@durham.ac.uk
Professor

P.J. Baker

F.L. Pratt

S.J. Clarke

S.J. Blundell

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.

Citation

Wright, J., Pitcher, M., Trevelyan-Thomas, W., Lancaster, T., Baker, P., Pratt, F., …Blundell, S. (2013). Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives. Physical review B, 88(6), Article 060401. https://doi.org/10.1103/physrevb.88.060401

Journal Article Type	Article
Publication Date	Aug 1, 2013
Deposit Date	Jan 16, 2014
Publicly Available Date	Jan 17, 2014
Journal	Physical Review B
Print ISSN	1098-0121
Electronic ISSN	1550-235X
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	88
Issue	6
Article Number	060401
DOI	https://doi.org/10.1103/physrevb.88.060401