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Short-range incommensurate magnetic order near the superconducting phase boundary inFe1+δTe1−xSex

Jinsheng Wen, Guangyong Xu, Zhijun Xu, Zhi Wei Lin, Qiang Li, W. Ratcliff, Genda Gu, J. M. Tranquada
2009 Physical Review B  

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2009 pre-print
arXiv:0906.3774v1 fatcat:f3xqesz4abcnva3jzvgd2vnjxq
2009 accepted
arXiv:0906.3774v2 fatcat:behevhvhtfhirgcveilg3fjuwq
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
more » ... 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.
doi:10.1103/physrevb.80.104506 fatcat:b5t5lycqr5fhdoudll4alczemu
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Jinsheng Wen, Guangyong Xu, Zhijun Xu, Zhi Wei Lin, Qiang Li, W. Ratcliff, Genda Gu, J. M. Tranquada. "Short-range incommensurate magnetic order near the superconducting phase boundary inFe1+δTe1−xSex." Physical Review B 80.10 (2009)