Bi_2Sr_2(Ca_(1-X)Ln_X)Cu_2O_(8+δ)の変調構造と置換効果

概要

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The modulated structure of the 'incommensurate' phase Bi_2Sr_2(Ca_(1-X)Ln_X)Cu_2O_(8+δ)(0≦x≦0.72) was wxmined by high-resolution transmission electron microscopy (HRTEM) and electron diffraction. This report represents a summary of our experimental results and theoretical consideration. The number of domain configurations i.e. commensurate structures observed by HRTEM is seventeen. On the other hand, the plot of the modulation period pa versus the Pr-concentrations x exhibits roughly a linear decrease but it has a staircase structure. The staircase structure covers a full range of commensurate structures predicted theoretically. The pattern in the plot pf pa versus x is consistent with the simulation based on the Frenkel-Kontrova model and an inhomogeneity hypothesis.
新潟工科大学の論文