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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Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R ChinaHong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
Wu, W
Wong, KH
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机构:Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
Wong, KH
Choy, CL
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机构:Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
机构:
Tsinghua Univ, Sch Mat Sci & Engn, Electron Microscopy Lab, Beijing 100084, Peoples R ChinaTsinghua Univ, Sch Mat Sci & Engn, Electron Microscopy Lab, Beijing 100084, Peoples R China
Wang, CC
Wang, H
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Tsinghua Univ, Sch Mat Sci & Engn, Electron Microscopy Lab, Beijing 100084, Peoples R ChinaTsinghua Univ, Sch Mat Sci & Engn, Electron Microscopy Lab, Beijing 100084, Peoples R China
Wang, H
Zhu, J
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Tsinghua Univ, Sch Mat Sci & Engn, Electron Microscopy Lab, Beijing 100084, Peoples R ChinaTsinghua Univ, Sch Mat Sci & Engn, Electron Microscopy Lab, Beijing 100084, Peoples R China