Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives
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+yA...
| Main Authors: | , , , , , , , |
|---|---|
| Formato: | Journal article |
| Idioma: | English |
| Publicado: |
2013
|
| Summary: | 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. |
|---|