TY - JOUR
T1 - Crystallographic features in lightly-doped La1 - xSr xMnO3
AU - Arao, M.
AU - Ueno, T.
AU - Asada, T.
AU - Koyama, Y.
AU - Minamisawa, C.
AU - Mogi, M.
AU - Inoue, Y.
N1 - Funding Information:
One of us (M.A.) would like to thank the Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists for financial support. A part of this work is financially supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science.
PY - 2004/10
Y1 - 2004/10
N2 - The crystallographic features of the simple perovskite oxides La 1-xSrxMnO3 with 0≤x≤0.08, which are known to be correlated-electron insulators, have been examined by X-ray powder diffraction and transmission electron microscopy. It was confirmed on the basis of the powder diffraction profiles obtained that the orthorhombic-to-monoclinic structural phase transition took place; for instance, at 500 K in the x=0.08 sample. The profiles also indicated that the structural transition accompanied the introduction of the Jahn-Teller distortion and the increase in both the orthorhombic distortion and the A-site-ion displacement. Based on the reciprocal lattices determined from electron diffraction patterns, further, it was found that these distortions and displacement never resulted in the change in the extinction rule of diffraction spots, and that the monoclinic distortion was actually involved in the low-temperature phase. That is, the structural phase transition can basically be regarded as a ferroelastic transition in terms of the lowering of the symmetry.
AB - The crystallographic features of the simple perovskite oxides La 1-xSrxMnO3 with 0≤x≤0.08, which are known to be correlated-electron insulators, have been examined by X-ray powder diffraction and transmission electron microscopy. It was confirmed on the basis of the powder diffraction profiles obtained that the orthorhombic-to-monoclinic structural phase transition took place; for instance, at 500 K in the x=0.08 sample. The profiles also indicated that the structural transition accompanied the introduction of the Jahn-Teller distortion and the increase in both the orthorhombic distortion and the A-site-ion displacement. Based on the reciprocal lattices determined from electron diffraction patterns, further, it was found that these distortions and displacement never resulted in the change in the extinction rule of diffraction spots, and that the monoclinic distortion was actually involved in the low-temperature phase. That is, the structural phase transition can basically be regarded as a ferroelastic transition in terms of the lowering of the symmetry.
KW - Jahn-Teller lattice distortion
KW - LaSr MnO
KW - Powder X-ray diffraction
KW - Structural phase transition
KW - Transmission electron microscopy
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U2 - 10.1016/j.physc.2003.11.070
DO - 10.1016/j.physc.2003.11.070
M3 - Article
AN - SCOPUS:4644324754
VL - 412-414
SP - 171
EP - 177
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - SPEC. ISS.
ER -