Valence transition in (Pr,Ca)CoO3 cobaltites: Charge migration at the metal-insulator transition

被引：53

作者：

Luis Garcia-Munoz, Jose ^{[1
]}

Frontera, Carlos ^{[1
]}

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

Valencia, Sergio ^{[2
]}

Blasco, Javier ^{[3
]}

Feyerherm, Ralf ^{[2
]}

Dudzik, Esther ^{[2
]}

Abrudan, Radu ^{[4
]}

Radu, Florin ^{[2
]}

机构：

[1] CSIC, Inst Ciencia Mat Barcelona, ICMAB, E-08193 Barcelona, Spain

[2] Helmholtz Zentrum Berlin, D-12489 Berlin, Germany

[3] Univ Zaragoza, Inst Ciencias Mat Aragon, CSIC, E-50009 Zaragoza, Spain

[4] Ruhr Univ Bochum, Inst Expt Phys Festkorperphys, D-44780 Bochum, Germany

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 04期

关键词：

SPIN-STATE TRANSITION; MAGNETIC-PROPERTIES; PEROVSKITE; TRANSPORT; LACOO3; PR; ND;

D O I：

10.1103/PhysRevB.84.045104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

X-ray absorption spectroscopy measurements in Pr0.5Ca0.5CoO3 and (Pr,Y)(0.55)Ca0.45CoO3 compositions reveal that the valence of praseodymium ions is stable and essentially +3 (Pr [4f(2)]) in the metallic state, but abruptly changes when carriers localize approaching the oxidation state +4 (Pr [4f(1)]). This mechanism appears to be the driving force of the metal-insulator transition. The ground insulating state of Pr0.5Ca0.5CoO3 is a homogeneous Co3.5-delta state stabilized by a charge transfer from Pr to Co sites: 1/2 Pr3+ +Co-3.5 --> 1/2 Pr3+2 delta +Co3.5-delta, with 2 delta approximate to 0.26e(-).

引用

页数：6

共 50 条

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