Direct magneto-optical observation of a structural phase transition in thin films of manganites

被引：86

作者：

Vlasko-Vlasov, VK

Lin, YK

Miller, DJ

Welp, U

Crabtree, GW

Nikitenko, VI

机构：

[1] Argonne Natl Lab, Argonne, IL 60439 USA

[2] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.84.2239

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The spontaneous formation of twins in La2/3Ca1/3MnO3 films below T-S similar to 105 K is observed by a magneto-optical technique. The twins are revealed as stripes along the {110} directions where magnetization tilts out of the film plane due to the stresses in twins. Their appearance is associated with a martensitic phase transition in the film triggered by the cubic-to-tetragonal transition in the SrTiO3 substrate. It is found that magnetization of the films proceeds by inhomogeneous rotation of magnetic moments. This is due to the presence of microscopic structural inhomogeneities. Their dominating role in the low-temperature transport can explain small effects of the transition at T-S on the resistivity.

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页码：2239 / 2242

页数：4

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