Short-range incommensurate magnetic order near the superconducting phase boundary in Fe(1+d)Te(1-x)Se(x)
| Autor: | Wen, Jinsheng, Xu, Guangyong, Xu, Zhijun, Lin, Zhi Wei, Li, Qiang, Ratcliff, W., Gu, Genda, Tranquada, J. M. |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 80, 104506 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.80.104506 |
| Popis: | 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. Comment: Version as appeared in PRB |
| Databáze: | arXiv |
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