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首页> 外文期刊>Physica status solidi, B. Basic research >Fluctuation-induced conductivity of (Y–Ce)Ba_2Cu_3O_(7–δ) superconductor
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Fluctuation-induced conductivity of (Y–Ce)Ba_2Cu_3O_(7–δ) superconductor

机译：（Y–Ce）Ba_2Cu_3O_（7–δ）超导体的涨落诱导电导率

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Systematic measurements of the in-plane and out-of-plane in conductivity fluctuations have been used to investigate the role of the cerium ion on the splitting of the pairing transition. This splitting, associated with a phase separation, was firstly observed in single crystals and polycrystalline samples of Y_(1–x)Pr_xBa_2Cu_3O_(7–δ). Considering that Ce is the rare-earth element most easily ionized to the t4 state and that in melttextured sample, it is possible to observe anisotropic effects, we examined the effect of this ion in the Y_(1–x)Ce_xBa_2Cu_3O_(7–δ) compound.We prepared three different samples: polycrystalline, pure melt-textured and Ce-doped melt-textured. Melttextured samples were prepared using the top-seeding growth technique and the polycrystalline sample by the standard solid-state reaction technique. The samples were characterized by X-ray diffraction, scanning electron microscopy (SEM) and electrical resistivity. To identify power-law divergences in the conductivity, the results were analyzed in terms of the temperature derivative of the resistivity (dr=dT) and of the logarithmic temperature derivative of the conductivity (-dlneDsT=dT). In the normal phase, Gaussian and critical regimes were clearly seen for melt-textured samples and no important differences between pure and Cedoped samples were observed. On the other hand, for the polycrystalline sample and from the critical exponent analysis, a splitting of the pairing transition was clearly observed. It is suggested that the occurrence of a phase separation and its association with Ce doping as already observed for Pr-doped samples.
机译：平面内和平面外电导率波动的系统测量已用于研究铈离子在配对跃迁分裂中的作用。这种分裂与相分离有关，是首先在Y_（1–x）Pr_xBa_2Cu_3O_（7–δ）的单晶和多晶样品中观察到的。考虑到Ce是最容易离子化为t4态的稀土元素，并且在熔融织构样品中，可以观察到各向异性效应，因此我们研究了该离子在Y_（1–x）Ce_xBa_2Cu_3O_（7–δ我们准备了三种不同的样品：多晶，纯熔体织构和Ce掺杂熔体织构。熔融织构的样品是使用种子生长法制备的，多晶样品是通过标准的固态反应技术制备的。通过X射线衍射，扫描电子显微镜（SEM）和电阻率表征样品。为了确定电导率的幂律散度，根据电阻率的温度导数（dr = dT）和电导率的对数温度导数（-dlneDsT = dT）分析了结果。在正常阶段，熔体变形样品清晰可见高斯和临界状态，纯样品和Cedoped样品之间未观察到重要差异。另一方面，对于多晶样品，从临界指数分析中，可以清楚地看到配对跃迁的分裂。建议已经发生了相分离及其与Ce掺杂的关系，正如Pr掺杂样品中已经观察到的那样。

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