In this work, epitaxial La1–xSrxMnO3 (LSMO) films were fabricated on SrTiO3 substrates at temperatures (Ts) ranging from 550 to 750 °C by RF magnetron sputtering. Significant Ts-dependent structural, magnetic, and magnetotransport properties were observed. The LSMO (Ts = 750 °C) film exhibits the colossal magnetoresistance (CMR) of −47% under the magnetic field (H) of 5 T. In contrast, the LSMO (Ts = 650 °C) film demonstrates a huge magnetoresistance (MR) of −98% (H = 5 T) around the metal-insulator transition temperature and –59% at 5 K. The spin-glass-like behaviors indicate that the defects, particularly the oxygen vacancies, in the epitaxial LSMO (Ts = 650 °C) films destroy the double exchange. The huge MR is related to the defect modulated magnetic structures and spin-dependent magnetotransport properties. Our work helps to understand the physical mechanism of the CMR and provides a way for tuning the magnetotransport properties of the perovskite films.
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28 October 2019
Research Article|
October 29 2019
Defects induced huge magnetoresistance in epitaxial La1–xSrxMnO3 thin films deposited by magnetic sputtering
Xinyue Wang;
Xinyue Wang
1
Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, School of Science, Tianjin University
, Tianjin 300350, People's Republic of China
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Chao Jin
;
Chao Jin
a)
1
Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, School of Science, Tianjin University
, Tianjin 300350, People's Republic of China
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Ping Wang;
Ping Wang
1
Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, School of Science, Tianjin University
, Tianjin 300350, People's Republic of China
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Xin Pang;
Xin Pang
1
Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, School of Science, Tianjin University
, Tianjin 300350, People's Republic of China
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Wanchao Zheng;
Wanchao Zheng
1
Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, School of Science, Tianjin University
, Tianjin 300350, People's Republic of China
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Dongxing Zheng;
Dongxing Zheng
1
Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, School of Science, Tianjin University
, Tianjin 300350, People's Republic of China
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Zhiqing Li
;
Zhiqing Li
1
Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, School of Science, Tianjin University
, Tianjin 300350, People's Republic of China
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Rongkun Zheng
;
Rongkun Zheng
a)
2
School of Physics, The University of Sydney
, NSW 2006, Australia
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Haili Bai
Haili Bai
1
Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, School of Science, Tianjin University
, Tianjin 300350, People's Republic of China
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Appl. Phys. Lett. 115, 182405 (2019)
Article history
Received:
July 21 2019
Accepted:
October 16 2019
Citation
Xinyue Wang, Chao Jin, Ping Wang, Xin Pang, Wanchao Zheng, Dongxing Zheng, Zhiqing Li, Rongkun Zheng, Haili Bai; Defects induced huge magnetoresistance in epitaxial La1–xSrxMnO3 thin films deposited by magnetic sputtering. Appl. Phys. Lett. 28 October 2019; 115 (18): 182405. https://doi.org/10.1063/1.5120838
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