Characteristic muon precession and relaxation signals in FeAs and FeAs2: Possible impurity phases in pnictide superconductors

被引：14

作者：

Baker, P. J. ^{[1
]}

Lewtas, H. J. ^{[1
]}

Blundell, S. J. ^{[1
]}

Lancaster, T. ^{[1
]}

Pratt, F. L. ^{[2
]}

Parker, D. R. ^{[3
]}

Pitcher, M. J. ^{[3
]}

Clarke, S. J. ^{[3
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[2] ISIS, Muon Facil, Didcot OX11 0QX, Oxon, England

[3] Univ Oxford, Dept Chem, Inorgan Chem Lab, Oxford OX1 3QR, England

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 21期

基金：

英国工程与自然科学研究理事会;

关键词：

iron compounds; magnetic impurities; Mossbauer effect; muon probes; superconducting materials;

D O I：

10.1103/PhysRevB.78.212501

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：4

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