Simultaneous metal-insulator and spin-state transitions in Pr0.5Ca0.5CoO3 -: art. no. 052418

被引：143

作者：

Tsubouchi, S

Kyômen, T

Itoh, M

Ganguly, P

Oguni, M

Shimojo, Y

Morii, Y

Ishii, Y

机构：

[1] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

[2] Tokyo Inst Technol, Dept Chem, Grad Sch Sci & Engn, Meguro Ku, Tokyo 1528551, Japan

[3] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Ibaraki 3191195, Japan

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.66.052418

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Pr0.5Ca0.5CoO3 showed a simultaneous metal-insulator and paramagnetic-paramagnetic spin-state transition of the first-order type at 90 K accompanied by a volume contraction by similar to2%. Neutron diffraction analysis revealed that the volume contraction is mainly attributed to the tilting of CoO6 octahedra which causes a decrease in the Co-O-Co angle. The electron configurations were proposed to be localized t(2g)(6) (trivalent Co) and t(2g)(5) (tetravalent Co) in the low-temperature phase and itinerant t(2g)(5)e(g)(0.5) in the high-temperature phase.

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页码：524181 / 524184

页数：4

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