High Resolution Neutron Powder Diffraction and Elastic Constant Measurements of La_<0.625>Ca_<0.375>MnO_3 at High Temperatures(Condensed Matter : Structure, Mechanical and Thermal Properties)

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概要

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• We investigated the structural phase transition occurring around 760 K in a colossal magnetoresistance material, La_<0.625>Ca_<0.375>MnO_3. In order to uncover detailed features of this transition between the high temperature rhombohedral (R3^^-c) and the low temperature orthorhombic phase (Pnma), high resolution neutron powder diffraction, resistivity measurements, and elastic constant measurements were carried out up to 1000K. From the Rietveld refinement analysis of the powder diffraction data, it is shown that the transition is of first order as expected from symmetry and that there exists a temperature region of 〜40 K around the transition temperature where the two phases coexist. This phase coexistence in the transition region accounts for the results of the elastic constant and resistivity measurements. Neutron powder diffraction data also allowed us to determine the tilt angles of the soft lattice modes, R_<25> and M_3, relevant to the phase transition.

• 一般社団法人日本物理学会の論文
• 2004-11-15

著者

• Song J.

  Department Of Endodontics School Of Dental Medicine University Of Pennsylvania

• Park S.

  Department Of Chemical Engineering Hanyang University

• CHOI Y.

  HANARO, Korea Atomic Energy Research Institute

• Jeong Y.

  Department Of Electronic And Electrical Engineering Pohang University Of Science And Technology

• Lee C.

  Hanaro Korea Atomic Energy Research Institute

• Yang C.-H.

  Department of Physics and Electron Spin Science Center, Pohang University of Science and Technology, Pohang 790-784, Korea

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