Nanodomain induced anomalous magnetic and electronic transport properties of LaBaCo2O5.5+δ highly epitaxial thin films

被引：10
作者：
Ruiz-Zepeda, F. [1 ]
Ma, C. [1 ]
Uribe, D. Bahena [1 ]
Cantu-Valle, J. [1 ]
Wang, H. [1 ]
Xu, Xing [1 ]
Yacaman, M. J. [1 ]
Chen, C. [1 ,2 ]
Lorenz, B. [2 ]
Jacobson, A. J. [2 ]
Chu, P. C. W. [2 ]
Ponce, A. [1 ]
机构：
[1] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA
[2] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA
来源：
JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 02期
基金：
美国国家科学基金会; 美国国家卫生研究院;
关键词：
CONDUCTIVITY RELAXATION; OXYGEN VACANCIES; PEROVSKITE; CATHODE; MAGNETORESISTANCE; PHOTOLUMINESCENCE; PRBACO2O5+DELTA; LA0.5BA0.5COO3;
D O I：
10.1063/1.4861406
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A giant magnetoresistance effect (similar to 46% at 20K under 7 T) and anomalous magnetic properties were found in a highly epitaxial double perovskite LaBaCo2O5.5+delta (LBCO) thin film on (001) MgO. Aberration-corrected Electron Microscopy and related analytical techniques were employed to understand the nature of these unusual physical properties. The as-grown film is epitaxial with the c-axis of the LBCO structure lying in the film plane and with an interface relationship given by (100)(LBCO) || (001)(MgO) and [001](LBCO) || [100](MgO) or [010](MgO). Orderly oxygen vacancies were observed by line profile electron energy loss spectroscopy and by atomic resolution imaging. Especially, oxygen vacancy and nanodomain structures were found to have a crucial effect on the electronic transport and magnetic properties. (C) 2014 AIP Publishing LLC.
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页数：5
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