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arXiv 1407.7611cond-mat.supr-concond-mat.str-el
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超导体BaPb $_{1-x}$ Bi $_x$ O $_3$中的条状纳米结构相分离和最佳不均匀性

Stripe-like nanoscale structural phase separation and optimal inhomogeneity in superconducting BaPb$_{1-x}$Bi$_x$O$_3$

P. Giraldo-Gallo, Y. Zhang, C. Parra, H. C. Manoharan, M. R. Beasley, T. H. Geballe, M. J. Kramer, I. R. Fisher

摘要:

在超导BaPb $_{1-x}$ Bi $_x$ O $_3$中观察到了部分无序条纹形式的结构相分离,其特征长度尺度在纳米范围内。超导相干长度的演变与组合物相对于这些条纹的大小表明在确定超导圆顶的形状的纳米结构的重要作用。提出最大值$T_c$由一种“最佳不均匀性”决定,其特征是从一个不均匀的宏观超导体到一个颗粒状超导体的交叉,对于这种交叉,相位涨落抑制了$T_c$ .

英文摘要:

Structural phase separation in the form of partially disordered stripes, with characteristic length scales in the nanometer range, is observed for superconducting BaPb$_{1-x}$Bi$_x$O$_3$. The evolution of the superconducting coherence length with composition relative to the size of these stripes suggests an important role of the nanostructure in determining the shape of the superconducting dome. It is proposed that the maximum $T_c$ is determined by a kind of "optimal inhomogeneity", characterized by a crossover from an inhomogeneous macroscopic superconductor to a granular superconductor for which phase fluctuations suppress $T_c$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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