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

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.

Keywords: manganite ion irradiation magnetoresistance

Received: 31 January 2013
Revised: 28 March 2013
Accepted manuscript online:

PACS:	75.47.Lx	(Magnetic oxides)
	73.43.Qt	(Magnetoresistance)
	81.40.-z	(Treatment of materials and its effects on microstructure, nanostructure, And properties)

Fund: 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).

Corresponding Authors: Wu Zhan-Wen, Zheng Dong-Ning
E-mail: iupro@163.com; dzheng@aphy.iphy.ac.cn

Cite this article:

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 2013 Chin. Phys. B 22 087503

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

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