Strain-induced insulator state and giant gauge factor of La0.7Sr0.3CoO3 films

被引：132

作者：

Rata, A. D. ^{[1
]}

Herklotz, A. ^{[1
]}

Nenkov, K. ^{[1
,2
]}

Schultz, L. ^{[1
]}

Doerr, K. ^{[1
]}

机构：

[1] IFW Dresden, Inst Met Mat, D-01069 Dresden, Germany

[2] Int Lab High Magnet Fields & Low Temp, PL-53421 Wroclaw, Poland

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.100.076401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A strain-induced change of the electrical conductivity by several orders of magnitude has been observed for ferromagnetic La0.7Sr0.3CoO3 films. Tensile strain is found to drive the narrow-band metal highly insulating. Reversible strain applied using a piezoelectric substrate reveals huge resistance modulations including a giant piezoresistive gauge factor of 7000 at 300 K. Magnetization data recorded for statically and reversibly strained films show moderate changes. This indicates a rather weak strain response of the low-temperature Co spin state. We suggest that a strain-induced static Jahn-Teller-type deformation of the CoO6 units may provide a localization mechanism that also has impact on electronic transport in the paramagnetic regime.

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页数：4

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