Variation of charge dynamics upon the helimagnetic and metal-insulator transitions for perovskite AFeO3 (A = Sr and Ca)

被引：18

作者：

Fujioka, J. ^{[1
,2
,3
]}

Ishiwata, S. ^{[1
,2
]}

Kaneko, Y. ^{[3
]}

Taguchi, Y. ^{[4
,5
]}

Tokura, Y. ^{[1
,2
,3
,4
,5
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[2] Univ Tokyo, QPEC, Tokyo 1138656, Japan

[3] Japan Sci & Technol Agcy, ERATO, Multiferro Project, Wako, Saitama 3510198, Japan

[4] RIKEN Adv Sci Inst, CERG, Wako, Saitama 3510198, Japan

[5] RIKEN Adv Sci Inst, Cross Correlated Mat Res Grp CMRG, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 15期

关键词：

DISPROPORTIONATION; CAFEO3;

D O I：

10.1103/PhysRevB.85.155141

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have spectroscopically investigated the charge dynamics for the high-quality single crystals of perovskite AFeO(3), which exhibit the helimagnetism (A = Sr and Ca) and/or the charge disproportionation (CD) transition (A = Ca). The metallic state at high temperatures, both for A = Sr and Ca, shows highly incoherent charge dynamics, while the optical spectra for A = Ca change in a wide energy upon the CD transition. These results are in accord with the picture of the phase change between the highly correlated metal and the anticorrelated CD insulator in this class of high Fe-valence perovskite.

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页数：5

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