Optical spectroscopy of charge-ordering transition in La1/3Sr2/3FeO3

被引：71

作者：

Ishikawa, T ^{[1
]}

Park, SK ^{[1
]}

Katsufuji, T ^{[1
]}

Arima, T ^{[1
]}

Tokura, Y ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 1998年 / 58卷 / 20期

关键词：

D O I：

10.1103/PhysRevB.58.R13326

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The change of the electronic structure and lattice dynamics upon the charge-ordering (CO) transition has been investigated for a La1/3Sr2/3FeO3 crystal by measurements of optical spectra. The CO transition, as characterized by sequential 2:1 ordering of nominal Fe3+ and Fe5+(111)(c )sheets at T-CO = 198 K, activates several additional optical phonon modes due to the charge modulation and opens an optical gap (up to 2 Delta similar to 0.13 eV). The spectral intensity of the activated phonon mode shows a discontinuous increase at T-CO reflecting the first-order nature of the CO transition. By contrast, the optical gap value increases rather continuously with decreasing temperature below T-CO, implying the effect of the concomitant antiferromagnetic spin ordering on the gap magnitude and structure. [S0163-1829(98)51542-1].

引用

页码：13326 / 13329

页数：4

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