Metal-insulator transition of ferromagnetic ordered double perovskites: (Sr1-yCay)2FeReO6

被引：90

作者：

Kato, H ^{[1
]}

Okuda, T

Okimoto, Y

Tomioka, Y

Oikawa, K

Kamiyama, T

Tokura, Y

机构：

[1] Joint Res Ctr Atom Technol, Tsukuba, Ibaraki 3050046, Japan

[2] KEK, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[3] AIST, Natl Inst Adv Ind Sci & Technol, CERC, Tsukuba, Ibaraki 3058562, Japan

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

来源：

PHYSICAL REVIEW B | 2002年 / 65卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.65.144404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Temperature- and composition-control metal-insulator (M-I) transitions have been investigated for ordered double perovskites, (Sr1-yCay)(2)FeReO6. Ca2FeReO6 (y=1) shows the thermally induced M-I transition associated with the lattice-structural transition around 150 K. The alloyed system undergoes the M-I transition in the almost fully spin-polarized ground state around y=0.4 with minimal enhancement of the electronic specific-heat coefficient but with a large energy-scale (similar to1 eV) change of the optical conductivity spectrum. These results indicate the importance of electron correlation, in particular the orbital correlation of Re t(2g) electrons, for the ferromagnetic M-I transition.

引用

页码：1 / 5

页数：5

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