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

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.

preprint2008arXivOpen access
C. TarantiniA. GurevichD. C. LarbalestierZ. A. RenX. L. DongW. LuZ. X. Zhao
cond-mat.supr-concond-mat.mtrl-sci
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C. TarantiniA. GurevichD. C. LarbalestierZ. A. RenX. L. DongW. LuZ. X. Zhao

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