Colossal magnetoresistance without phase separation: Disorder-induced spin glass state and nanometer scale orbital-charge correlation in half doped manganites

被引：109

作者：

Mathieu, R ^{[1
]}

Akahoshi, D

Asamitsu, A

Tomioka, Y

Tokura, Y

机构：

[1] AIST Cent 4, JST, ERATO SSS, Spin Superstruct Project, Tsukuba, Ibaraki 3058562, Japan

[2] AIST Cent 4, CERC, Tsukuba, Ibaraki 3058562, Japan

[3] Univ Tokyo, Cryogen Res Ctr, Bunkyo Ku, Tokyo 1130032, Japan

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

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.93.227202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetic and electrical properties of high-quality single crystals of A-site disordered (solid solution) Ln(0.5)Ba(0.5)MnO(3) are investigated near the phase boundary between the spin-glass insulator and colossal-magnetoresistive ferromagnetic metal, locating near Ln=Sm. The temperature dependence of the ac susceptibility and the x-ray diffuse scattering of Eu0.5Ba0.5MnO3 are analyzed in detail. The uniformity of the random potential perturbation in Ln(0.5)Ba(0.5)MnO(3) crystals with a small bandwidth yields, rather than the phase separation, an homogeneous short ranged charge or orbital order which gives rise to a nearly atomic spin-glass state. Remarkably, this microscopically disordered "charge-exchange-glass" state alone is able to bring forth the colossal magnetoresistance.

引用

页数：4

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