Effects of oxygen incorporation in tensile La0.84Sr0.16MnO3-δ thin films during ex situ annealing -: art. no. 012412

被引：32
|
作者：
Seo, SH [1 ]
Kang, HC [1 ]
Jang, HW [1 ]
Noh, DY [1 ]
机构：
[1] Gwangju Inst Sci & Technol, Dept Mat Sci & Technol, Kwangju, South Korea
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 01期
关键词：
D O I：
10.1103/PhysRevB.71.012412
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Structural changes in epitaxial La0.84Sr0.16MnO3-delta (LSMO) (001)/SrTiO3(001) thin films are studied using x-ray scattering during thermal annealing. As oxygen atoms are incorporated during annealing ex situ in air, the unit-cell volume contracts, which is attributed to the increased ratio of Mn4+ ions as indicated by enhanced saturation magnetization and ferromagnetic transition temperature. The unit-cell contraction occurs rather abruptly, suggesting that a structural phase transition happens during annealing. A 200-Angstrom-thick film remains almost fully strained even after annealing. In this case, a fourfold structural modulation is observed which accommodates the augmented lattice strain energy.
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页数：3
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