Fe ~（1+）y（Te1-x，Sex）（0 < x < 0.20）从反铁磁性到超导电性的中子粉末衍射分析
From antiferromagnetism to superconductivity in Fe 1+y(Te1-x,Sex) (0 < x < 0.20): a neutron powder diffraction analysis
摘要：
用Rietveld方法对Fe_（1 +y）（Te_（1-x），Sex）（0 < x < 0.20）化合物在2 ~ 300 K温度范围内的核结构和磁结构进行了研究。x < 0.075的样品在低温下发生四方相到单斜相变，其临界温度随着Se含量的增加而降低;这种结构转变与Fe位的长程反铁磁有序严格耦合。在0.10 <x0.05时，向单斜相的转变和长程反铁磁性都受到抑制< 0.20. The onset of the structural and of the magnetic transition remains coincident with the increase of Se substitution. The low temperature monoclinic crystal structure has been revised. Superconductivity arises for x >，因此在FeTe-FeSe赝二元相图中存在一个超导性和长程反铁磁性共存的重要区域。
英文摘要：
The nuclear and magnetic structure of Fe1+y(Te1-x,Sex) (0 < x < 0.20) compounds was analyzed between 2 K and 300 K by means of Rietveld refinement of neutron powder diffraction data. Samples with x < 0.075 undergo a tetragonal to monoclinic phase transition at low temperature, whose critical temperature decreases with increasing Se content; this structural transition is strictly coupled to a long range antiferromagnetic ordering at the Fe site. Both the transition to a monoclinic phase and the long range antiferromagnetism are suppressed for 0.10 < x < 0.20. The onset of the structural and of the magnetic transition remains coincident with the increase of Se substitution. The low temperature monoclinic crystal structure has been revised. Superconductivity arises for x > 0.05, therefore a significant region where superconductivity and long range antiferromagnetism coexist is present in the pseudo-binary FeTe - FeSe phase diagram.
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