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arXiv 0906.3774cond-mat.supr-con
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Fe(1+d)Te(1-x)Se(x)超导相界附近的短程无公度磁序

Short-range incommensurate magnetic order near the superconducting phase boundary in Fe(1+d)Te(1-x)Se(x)

Jinsheng Wen, Guangyong Xu, Zhijun Xu, Zhi Wei Lin, Qiang Li, W. Ratcliff, Genda Gu, J. M. Tranquada

摘要:

我们对Fe(1.07)Te(0.75)Se(0.25)和FeTe(0.7)Se(0.3)进行了弹性中子散射和磁化测量。在这两个样品中观察到短程无公度磁序。在Fe含量较高的样品中,低温下在(0.46,0,0.5)附近出现宽磁峰,而在FeTe(0.7)Se(0.3)中,宽磁峰更接近反铁磁(AFM)波矢(0.5,0,0.5)。的不相称的峰只观察到的AFM波矢量的一侧上的两个样品,这可以被建模的铁磁/反铁磁最近邻自旋之间的相关性的不平衡。我们还发现,随着Se浓度的增加(和Fe浓度的降低),磁序随着超导温度和体积的增加而变弱。

英文摘要:

We performed elastic neutron scattering and magnetization measurements on Fe(1.07)Te(0.75)Se(0.25) and FeTe(0.7)Se(0.3). Short-range incommensurate magnetic order is observed in both samples. In the former sample with higher Fe content, a broad magnetic peak appears around (0.46,0,0.5) at low temperature, while in FeTe(0.7)Se(0.3) the broad magnetic peak is found to be closer to the antiferromagnetic (AFM) wave-vector (0.5,0,0.5). The incommensurate peaks are only observed on one side of the AFM wave-vector for both samples, which can be modeled in terms of an imbalance of ferromagnetic/antiferromagnetic correlations between nearest-neighbor spins. We also find that with higher Se (and lower Fe) concentration, the magnetic order becomes weaker while the superconducting temperature and volume increase.

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