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arXiv 0805.4445cond-mat.supr-concond-mat.mtrl-sci
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高场顺磁超导体Nd(O,F)FeAs中的反铁磁性和超导电性能共存吗?

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

C. Tarantini, A. Gurevich, D. C. Larbalestier, Z. A. Ren, X. L. Dong, W. Lu, Z. X. Zhao

摘要:

本文测量了Nd(O_(0.89)F_(0.11))FeAs的磁化强度M(T,H)随温度和磁场的变化,结果表明,在临界温度Tc ~ 51 K的超导性不能与反铁磁有序共存。虽然M(T,H)在55 < T <140 K时表现出明显的居里-外斯温度关系,对应于Neel温度TN ~ 11- 12 K,但低于Tc时的行为只与弱相互作用磁矩的顺磁性或自旋玻璃态相一致。我们认为,Nd(O_(1-x)Fx)FeAs超导体的反常磁行为主要是由磁性Nd离子决定的。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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