Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives

Journal article

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 1.5K, 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. © 2013 American Physical Society.

Authors: Wright, J; Pitcher, M; Trevelyan-Thomas, W; Lancaster, T; Baker, P

• Publication status: Published
• Journal: Physical Review B
• Volume: 88
• Issue: 6
• Publication date: 2013-08-06
• DOI: 10.1103/PhysRevB.88.060401
• EISSN: 1550-235X
• ISSN: 1098-0121
• Language: English