Effect of structural parameters on superconductivity in fluorine-free LnFeAsO1-y (Ln = La, Nd)

被引：533

作者：

Lee, Chul-Ho ^{[1
]}

Iyo, Akira ^{[1
]}

Eisaki, Hiroshi ^{[1
]}

Kito, Hijiri ^{[1
]}

Fernandez-Diaz, Maria Teresa ^{[2
]}

Ito, Toshimitsu ^{[1
]}

Kihou, Kunihiro ^{[1
]}

Matsuhata, Hirofumi ^{[1
]}

Braden, Markus ^{[3
]}

Yamada, Kazuyoshi ^{[4
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[3] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[4] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷 / 08期

关键词：

oxypnictides; superconductivity; powder neutron diffraction; crystal structure analysis;

D O I：

10.1143/JPSJ.77.083704

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The crystal Structure of LnFeAsO(1-y) (Ln = La, Nd) has been Studied by the powder neutron diffraction technique. The superconducting phase diagram of NdFeAsO1-y is established as a function of oxygen content which is determined by Rietveld refinement. The small As-Fe bond length suggests that As and Fe atoms are connected covalently. FeAS(4)-tetrahedrons transform toward a regular Shape With increasing oxygen deficiency. Superconducting transition temperatures scent to attain maxinium values for regular FeAS(4)-tetrahedrons.

引用

页数：4

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