Pressure-Induced Modification of Crystal Structure in NdFeAsO1-y (1-y=0.85), Accompanied by Remarkable Suppression of Tc
Pressure-Induced Modification of Crystal Structure in NdFeAsO1-y (1-y=0.85), Accompanied by Remarkable Suppression of Tc
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DOI：
10.1143/jpsj.78.013705
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发表时间：
2009-01
影响因子：
1.7
通讯作者：
R. Kumai;N. Takeshita;T. Ito;H. Kitô;A. Iyo;H. Eisaki
中科院分区：
文献类型：
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作者：
R. Kumai;N. Takeshita;T. Ito;H. Kitô;A. Iyo;H. Eisaki
用同步辐射X射线衍射数据的Rietveld分析确定了加压下标题氧磷属化合物的原子位置。流体静压对晶体结构的影响表现在两个方面：（i）Fe-As和Nd-O层在~ 0.2%/GPa的速率下几乎各向同性压缩;（ii）层间距（本文中定义为相邻As和Nd面之间的距离）在~ 0.7%/GPa的速率下显著收缩。显着的抑制T c的静水压力将源于电子结构的变化所造成的晶体结构的修改。可能的起源将被讨论。
The atomic positions of the title oxypnictide compound under pressure were determined by Rietveld analysis of synchrotron X-ray diffraction data. Hydrostatic pressure has effects on the crystal structure in two points: (i) nearly isotropic compression of each of the Fe–As and Nd–O layers at the rate of ∼0.2%/GPa and (ii) outstanding shrinkage of the interlayer spacing (defined as the distance between adjacent As and Nd planes in this paper) at the rate of ∼0.7%/GPa. Remarkable suppression of T c by hydrostatic pressure would originate from the change in the electronic structure caused by the modification of the crystal structure. The possible origins will be discussed.