Convergent-Beam Electron Diffraction Study of the Low-Temperature Ferromagnetic Insulator Phase of La_<1-x>Sr_xMnO_3 (x=0.11, 0.12) : Condensed Matter: Structure, etc.

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The low-temperature ferromagnetic insulator (FMI) phase of La_<1-x>Sr_xMnO_3 (x = 0.11,0.12) was investigated by convergent-beam electron diffraction (CBED) together with selected-area electron diffraction (SAED). We have revealed that the FMI phase belongs to the triclinic space group P1^^-, and has a unit cell of 〜2a_c × 4b_c × 4c_c, where a_c, b_c, c_c are lattice parameters in the pseudocubic perovskite notation. These findings indicate that the FMI phase is neither the re-entrant phase of the high temperature phase (〜√<2>a_c ×2√<2>b_c × 2c_c) as reported by Kawano et al. nor the polaron-ordering phase with a unit cell of (〜2a_c × 2b_c × 4c_c) as proposed by Yamada et al.
社団法人日本物理学会の論文
2001-04-15