Phase Diagram and EXAFS Study of La_<0.7>Ca_<0.3-x>Ba_xMnO_3 Manganites (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• The phase diagram and local structure of La_<0.7>Ca_<0.3-x>Ba_xMnO_3 (x = 0; 0.03; 0.06;...; 0.3) lanthanum manganites were studied. The Curie temperature, T_c, of the compositions showed a sharp change near the concentrational structural orthorhombic-rhombohedral phase transition. Maximums of dispersion, σ^2_<Mn-O>, and asymmetry, σ^3_<Mn-O> of pair distribution function for the Mn-O bond distances of MnO_6 octahedron on x-dependence were observed by extended X-ray absorption fine structure (EXAFS) analysis. The maximum of σ^2_<Mn-O> is caused by increase of dynamic rms displacements of Mn-O bond distances near the T_c. The observed x dependence of σ^3_<Mn-O> reflects the reduction of charge carriers mobility at approaching to T_c.

• 社団法人日本物理学会の論文
• 2003-05-15

著者

• Yu S‐c

  Department Of Physics Chungbuk National University

• YU Seong-Cho

  Department of Physics, Chung-Buk National University

• Yu Seong-cho

  Department Of Physics Chung-buk National University:department Of Physics University Of Maryland

• Yang D‐s

  Physics Division School Of Science Education Chungbuk National University

• Ulyanov A.

  Department Of Physics Chungbuk National University:donetsk Physico-technicat Institute Of National A

• YANG Dong-Seok

  Physics Division, School of Science Education, Chungbuk National University

• Dong-seok Yang

  Department Of Physics Chungbuk National University

• Ulyanov A.

  Department Of Physics Chungbuk National University:donetsk Physico-technical Institute Of National A

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