Symmetrical Staircase in the Profile of Lattice-Modulation Period versus Pr-Concentration and Domain Configurations in Bi_2Sr_2(Ca_<1-x>Pr_x)Cu_2O_<8+δ> : Condensed Matter: Structure, etc.
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概要
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Variation of the lattice-modulation period p_a of the 'incommensurate' phase Bi_2Sr_2(Ca_<1-x>Pr_x)Cu_2O_<8+σ> (0 <__= x <__= 0.72) with Pr-concentration x was examined by electron diffraction, and the domain configuration by high-resolution transmission electron microscopy (HRTEM). The plot of p_a versus x exhibits roughly a linear decrease but it has a staircase structure. The period of each stair, p_a, agrees with a value expected for a commensurate structure. We observed nine stair which are symmetrically arranged; the central stair corresponds to the primary structure with a simple modulation, and a stair on the left (or right) is associated with an advanced (or delayed) discommensuration. On the other hand, the number of domain configurations i.e. commensurate structures observed by HRTEM is seventeen. The observed staircase structure covers a full range of commensurate structures predicted theoretically. The pattern observed in the plot of p_a versus x is consistent with the simulation based on the Frenkel-Kontrova model and an inhomogeneity hypothesis.
- 社団法人日本物理学会の論文
- 2000-04-15
著者
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Onozuka Takashi
Niigata Institute Of Technology
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NIIZEKI Komajiro
Department of Physics,Graduate School of Science,Tohoku University
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Niizeki Komajiro
Department Of Physics Faculty Of Science Tohoku University
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NIIZEKI Komajiro
Department of Physics, Graduate School of Science, Tohoku University
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