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arXiv 0710.1306cond-mat.str-elcond-mat.mtrl-sci
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La_(0.7)Sr_(0.3)CoO_3的应变诱导绝缘态

Strain-induced insulator state in La_0.7Sr_0.3CoO_3

A. D. Rata, A. Herklotz, K. Nenkov, L. Schultz, K. Doerr

摘要:

本文报道了在铁磁La_(0.7)Sr_(0.3)CoO_3薄膜中观察到的应变诱导绝缘态。拉伸应变超过1%被发现提高电阻率的几个数量级。使用压电衬底施加的0.15%的可逆应变触发了巨大的电阻调制,包括在300 K下顺磁区的10倍的变化。然而,低于铁磁有序温度,磁化强度数据表明弱依赖于应变的Co离子的自旋状态。我们解释的应变引起的分裂的Co e_g水平和减少双交换,结合在电子簇态的双折射型导电的输运性质的变化。

英文摘要:

We report on the observation of a strain-induced insulator state in ferromagnetic La_0.7Sr_0.3CoO_3 films. Tensile strain above 1% is found to enhance the resistivity by several orders of magnitude. Reversible strain of 0.15% applied using a piezoelectric substrate triggers huge resistance modulations, including a change by a factor of 10 in the paramagnetic regime at 300 K. However, below the ferromagnetic ordering temperature, the magnetization data indicate weak dependence on strain for the spin state of the Co ions. We interpret the changes observed in the transport properties in terms of a strain-induced splitting of the Co e_g levels and reduced double exchange, combined with a percolation-type conduction in an electronic cluster state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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