Long-aging effects on the properties of La0.5Sr0.5CoO3-δ films

被引：21
|
作者：
Prokhorov, VG [1 ]
Lee, YP
Kim, KW
Ishchuk, VM
Chukanova, IN
机构：
[1] Natl Acad Sci, Inst Met Phys, UA-03142 Kiev, Ukraine
[2] Hanyang Univ, Dept Phys, Seoul 133791, South Korea
[3] Sunmoon Univ, Dept Phys, Asan 336840, South Korea
[4] Natl Acad Sci, Inst Single Crystals, UA-680042 Kharkov, Ukraine
来源：
APPLIED PHYSICS LETTERS | 2002年 / 80卷 / 13期
关键词：
D O I：
10.1063/1.1466520
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The transport and magnetic properties of as-deposited and long-aged La0.5Sr0.5CoO3-delta films prepared by pulsed laser deposition have been investigated. It was found that an oxygen deficiency in the aged film leads not only to a change in the Co3+:Co4+ ratio, but to the formation of a structural disorder in the Co-O-Co conduction channel due to the accumulated oxygen vacancies. In addition to the usual ferromagnetic transition at T(C)similar or equal to250 K, the second magnetic transition was observed at T(M)approximate to50 K, which is treated as a freezing of the spin-glass state provided by the weak disorder in the oxygen arrangement. (C) 2002 American Institute of Physics.
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页码：2353 / 2355
页数：3
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