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首页> 外文期刊>Physical review >Neutron powder diffraction investigation of the structural and magnetic properties of (La_(1-y)Y_y)FeAsO (y=0.10, 0.20, and 0.30)
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Neutron powder diffraction investigation of the structural and magnetic properties of (La_(1-y)Y_y)FeAsO (y=0.10, 0.20, and 0.30)

机译：（La_（1-y）Y_y）FeAsO（y = 0.10、0.20和0.30）的结构和磁性的中子粉末衍射研究

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摘要

The structural, magnetic, and resistive properties of (La_(1-y)Y_y)FeAsO compounds (y=0.10, 0.20, and 0.30) have been investigated by means of x-ray and neutron powder diffractions as well as by resistivity measurements. The temperatures at which the structural transition from tetragonal to orthorhombic and the magnetic ordering take place progressively reduce by similar amounts with increasing Y substitution on account of the progressive chemical pressure increase. We propose that the structural transition could be originated by a cooperative Jahn-Teller distortion involving the alignment of the fully occupied Fe 3d_(z~2) orbitals in the Fe plane along the y axis, leading to the branching of the cell parameters a and b. The inagnetic structure develops after the occurrence of the structural transition but before its completion.
机译：（La_（1-y）Y_y）FeAsO化合物（y = 0.10、0.20和0.30）的结构，磁性和电阻特性已通过X射线和中子粉末衍射以及电阻率测量进行了研究。由于渐进的化学压力增加，随着Y取代的增加，从四方到正交的结构转变和磁有序发生的温度以相似的量逐渐降低。我们认为结构转变可能是由合作的Jahn-Teller变形引起的，涉及整个Fe平面中的Fe 3d_（z〜2）轨道沿y轴在Fe平面上的对齐，从而导致单元参数a和b的分支。 b。无意义的结构在发生结构转变之后但在其完成之前发展。

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