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Can antiferromagnetism and superconductivity coexist in the high-field paramagnetic superconductor Nd(O,F)FeAs?

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arxiv 0805.4445 v1 pith:PJYZYNZ7 submitted 2008-05-28 cond-mat.supr-con cond-mat.mtrl-sci

C. Tarantini , A. Gurevich , D.C. Larbalestier , Z.A. Ren , X.L. Dong , W. Lu , Z.X. Zhao This is my paper · ORCID
classification cond-mat.supr-concond-mat.mtrl-sci
keywords temperaturefeasmagneticbehaviorcoexisthigh-fieldparamagneticsuperconductivity
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We present measurements of the temperature and field dependencies of the magnetization M(T,H) of Nd(O0.89F0.11)FeAs at fields up to 33T, which show that superconductivity with the critical temperature Tc ~ 51K cannot coexist with antiferromagnetic ordering. Although M(T,H) at 55 < T < 140K exhibits a clear Curie-Weiss temperature dependence corresponding to the Neel temperature TN ~ 11-12K, the behavior of M(T,H) below Tc is only consistent with either paramagnetism of weakly interacting magnetic moments or a spin glass state. We suggest that the anomalous magnetic behavior of an unusual high-field paramagnetic superconductor Nd(O1-xFx)FeAs is mostly determined by the magnetic Nd ions.

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