Pressure-Induced Modification of Crystal Structure in NdFeAsO1-y (1-y=0.85), Accompanied by Remarkable Suppression of Tc

被引：18

作者：

Kumai, Reiji ^{[1
]}

Takeshita, Nao ^{[1
]}

Ito, Toshimitsu ^{[1
]}

Kito, Hijiri ^{[1
]}

Iyo, Akira ^{[1
]}

Eisaki, Hiroshi ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058562, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 01期

关键词：

oxypnictide superconductor; NdFeAsO1-y; synchrotron X-ray diffraction; hydrostatic pressure; Rietveld analysis; crystal structure; atomic position; SUPERCONDUCTIVITY; LAO1-XFXFEAS;

D O I：

10.1143/JPSJ.78.013705

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 similar to 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 similar to 0.7%/GPa. Remarkable suppression of 7,, 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.

引用

页数：4

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