Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-09-15
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, corrected Figure 3
Scientific paper
10.1103/PhysRevB.78.212501
We report muon-spin relaxation measurements of highly homogeneous samples of FeAs and FeAs2, both previously found as impurity phases in some samples of recently synthesized pnictide superconductors. We observe well defined muon precession in the FeAs sample with two precession frequencies of 38.2(3) and 22.7(9) MHz at 7.5 K, with the majority of the amplitude corresponding to the lower frequency component. In FeAs2 we confirm previous measurements showing that no long-ranged magnetic order occurs above 2 K and measure the muon spin relaxation rate, which increases on cooling. Our results exclude the possibility that previous muon-spin relaxation measurements of pnictide superconductors have been measuring the effect of these possible impurities.
Baker Peter J.
Blundell Stephen J.
Clarke Simon J.
Lancaster Tom
Lewtas H. J.
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