Role of A-site cations in the metal-insulator transition in Pr0.5Ca0.5CoO3-γ (γ≈0)

被引：40

作者：

Baron-Gonzalez, A. J. ^{[1
]}

Frontera, C. ^{[1
]}

Garcia-Munoz, J. L. ^{[1
]}

Blasco, J. ^{[2
]}

Ritter, C. ^{[3
]}

机构：

[1] CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, Spain

[2] Univ Zaragoza, Inst Ciencias Mat Aragon, Dept Fis Mat Condensada, CSIC, E-50009 Zaragoza, Spain

[3] Inst Laue Langevin, F-38100 Grenoble, France

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 05期

关键词：

TRANSPORT-PROPERTIES; MAGNETIC-PROPERTIES; PR; LA; ND; PR1-XCAXCOO3; TEMPERATURE; DIFFRACTION; PEROVSKITE; COBALTITES;

D O I：

10.1103/PhysRevB.81.054427

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Remarkable structural changes take place during the metal to insulator first-order transition in Pr0.50Ca0.50CoO3: a contraction of the unit-cell volume, the bending of the Co-O-Co bond angle, and a decrease in (Pr,Ca)-O bond distance. However, the Co-O bond length and the volume of the CoO6 octahedra remain almost unaltered during the transition. In view of these data and the absence of transition in (Nd2/3La1/3)(0.5)Ca0.5CoO3, we review the current spin-state transition picture, emphasizing that an active role is played by the A-site Pr cations that could be related with the effect of Pr in 123 superconducting cuprates.

引用

页数：6

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