Field-induced insulator-metal-insulator transitions in low-energy H2+ ion-irradiated epitaxial La2/3Ca1/3MnO3 thin films

doi:10.1088/1674-1056/22/8/087503

中国物理B ›› 2013, Vol. 22 ›› Issue (8): 87503-087503.doi: 10.1088/1674-1056/22/8/087503

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Field-induced insulator-metal-insulator transitions in low-energy H₂⁺ ion-irradiated epitaxial La_2/3Ca_1/3MnO₃ thin films

伍展文^{a b}, 李洁^a, 黎松林^a, 郑东宁^a

a Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b Institute of Testing and Research, Zhongshan Power Supply Bureau, Guangdong Power Grid Corporation, Zhongshan 528400, China

收稿日期:2013-01-31 修回日期:2013-03-28 出版日期:2013-06-27 发布日期:2013-06-27
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2011CBA00106) and the National Natural Science Foundation of China (Grant Nos. 11174342, 11161130519, and 11104333).

Field-induced insulator-metal-insulator transitions in low-energy H₂⁺ ion-irradiated epitaxial La_2/3Ca_1/3MnO₃ thin films

Wu Zhan-Wen (伍展文)^{a b}, Li Jie (李洁)^a, Li Song-Lin (黎松林)^a, Zheng Dong-Ning (郑东宁)^a

a Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b Institute of Testing and Research, Zhongshan Power Supply Bureau, Guangdong Power Grid Corporation, Zhongshan 528400, China

Received:2013-01-31 Revised:2013-03-28 Online:2013-06-27 Published:2013-06-27
Contact: Wu Zhan-Wen, Zheng Dong-Ning E-mail:iupro@163.com; dzheng@aphy.iphy.ac.cn
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2011CBA00106) and the National Natural Science Foundation of China (Grant Nos. 11174342, 11161130519, and 11104333).

摘要/Abstract

摘要： Epitaxial La_2/3Ca_1/3MnO₃ thin films grown on LaAlO₃ (001) substrates were irradiated with low-energy 120-keV H₂⁺ ions over doses ranging from 10¹² ions/cm² to 10¹⁷ ions/cm². The irradiation suppresses the intrinsic insulator-metal (I-M) transition temperature and increases the resistance by reducing the crystallographic symmetry of the films. No irradiation-induced columnar defects were observed in any of the samples. The specific film irradiated at a critical dose around 8 × 10¹⁵ ions/cm² is in a threshold state of the electric insulator where the I-M transition is absent. In an external field of 4 T or higher, the I-M transition is restored and thus an enormous magnetoresistance is observed, while a negative temperature coefficient resumes as the temperature is reduced further. Magnetic relaxation behavior is confirmed in this and other heavily irradiated samples. The results are interpreted in terms of the displacement of oxygen atoms provoked by ion irradiation and the resulting magnetic glassy state, which can be driven into a phase coexistence of metallic ferromagnetic droplets and the insulating glass matrix in a magnetic field.

关键词: manganite, ion irradiation, magnetoresistance

Abstract: Epitaxial La_2/3Ca_1/3MnO₃ thin films grown on LaAlO₃ (001) substrates were irradiated with low-energy 120-keV H₂⁺ ions over doses ranging from 10¹² ions/cm² to 10¹⁷ ions/cm². The irradiation suppresses the intrinsic insulator-metal (I-M) transition temperature and increases the resistance by reducing the crystallographic symmetry of the films. No irradiation-induced columnar defects were observed in any of the samples. The specific film irradiated at a critical dose around 8 × 10¹⁵ ions/cm² is in a threshold state of the electric insulator where the I-M transition is absent. In an external field of 4 T or higher, the I-M transition is restored and thus an enormous magnetoresistance is observed, while a negative temperature coefficient resumes as the temperature is reduced further. Magnetic relaxation behavior is confirmed in this and other heavily irradiated samples. The results are interpreted in terms of the displacement of oxygen atoms provoked by ion irradiation and the resulting magnetic glassy state, which can be driven into a phase coexistence of metallic ferromagnetic droplets and the insulating glass matrix in a magnetic field.

Key words: manganite, ion irradiation, magnetoresistance

中图分类号: (Magnetic oxides)

75.47.Lx

73.43.Qt (Magnetoresistance) 81.40.-z (Treatment of materials and its effects on microstructure, nanostructure, And properties)

伍展文, 李洁, 黎松林, 郑东宁. Field-induced insulator-metal-insulator transitions in low-energy H₂⁺ ion-irradiated epitaxial La_2/3Ca_1/3MnO₃ thin films[J]. 中国物理B, 2013, 22(8): 87503-087503.

Wu Zhan-Wen (伍展文), Li Jie (李洁), Li Song-Lin (黎松林), Zheng Dong-Ning (郑东宁). Field-induced insulator-metal-insulator transitions in low-energy H₂⁺ ion-irradiated epitaxial La_2/3Ca_1/3MnO₃ thin films[J]. Chin. Phys. B, 2013, 22(8): 87503-087503.

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Field-induced insulator-metal-insulator transitions in low-energy H₂⁺ ion-irradiated epitaxial La_2/3Ca_1/3MnO₃ thin films

Field-induced insulator-metal-insulator transitions in low-energy H₂⁺ ion-irradiated epitaxial La_2/3Ca_1/3MnO₃ thin films

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