Variation of the electronic structure in systematically synthesized Sr2MO4 (M=Ti, V, Cr, Mn, and Co) -: art. no. 176404

被引：86

作者：

Matsuno, J

Okimoto, Y

Kawasaki, M

Tokura, Y

机构：

[1] Japan Sci & Technol Corp, Spin SuperStruct Project, ERATO, AIST, Tsukuba, Ibaraki 3058562, Japan

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

[3] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan

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

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.95.176404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have systematically synthesized single-crystalline thin films of layered perovskites Sr2MO4 (M=Ti, V, Cr, Mn, and Co) which cannot be obtained in a form of bulk crystal apart from M=Mn. The two-dimensional electronic structure of these M4+ oxides, ranging from a correlated insulator to a ferromagnetic metal, has been investigated by using their optical conductivity spectra with polarizations E perpendicular to c and E parallel to c, which reveal systematic variation of the correlated charge gap, Mott-Hubbard gap, or charge-transfer gap. Temperature dependence of the gap-transition spectra is argued in the light of possible spin and/or orbital ordering.

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