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首页> 外文期刊>Journal of Low Temperature Physics >A Comparative Study of High-Field Diamagnetic Fluctuations in Deoxygenated YBa_(2)Cu_(3)O_(7-x) and Polycrystalline (Bi-Pb)_(2)Sr_(2)Ca_(2)Cu_(3)O_(10)
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A Comparative Study of High-Field Diamagnetic Fluctuations in Deoxygenated YBa_(2)Cu_(3)O_(7-x) and Polycrystalline (Bi-Pb)_(2)Sr_(2)Ca_(2)Cu_(3)O_(10)

机译：脱氧YBa_（2）Cu_（3）O_（7-x）和多晶（Bi-Pb）_（2）Sr_（2）Ca_（2）Cu_（3）O_（）的高场反磁涨落的比较研究10）

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We studied three single crystals of YBa_(2)Cu_(3)O_(7-x), (Y123) with superconducting transition temperature, T_(c)velence62.5, 52, and 41 K, and a highly textured polycrystalline specimen of (Bi-Pb)_(2)Sr_(2)Ca_(2)Cu_(3)O_(10) (Bi2223), with T_(c)velence108K. Isofield magnetization data were obtained as a function of temperature, with the magnetic field applied parallel to the c axis of each sample. The reversible magnetization data for all samples exhibited a rounded transition as magnetization tended toward zero. The reversible data were interpreted in terms of two-dimensional diamagnetic lowest-Landau-level (LLL) fluctuation theory. The LLL scaling analysis yielded consistent values of the superconducting transition temperatures T_(c)(H) for the various samples. The resulting scaling data were fit well by the two-dimensional LLL expression for magnetization obtained by Tesanovic and colaborators, producing reasonable values of kappa but the fitting parameter (partial deriv)H_(c2)/(partial deriv)T produced values that were larger than the experimentally determined ones. We performed simultaneous scaling of Y123 data and Bi2223, obtaining a single collapsed curve. The single curve was obtained after multiplying the x and y axis of each scaling curve by appropriate sample-dependent scaling factors. An expression for the two-dimensional x-axis LLL scaling was extracted from theory, allowing comparison of theoretical values of the x-axis scaling factors with the experimental values. The comparison between the values of the x-axis produced a deviation of 40percent which suggests that the hypothesis of universality of the two-dimensional LLL fluctuations is not supported by the studied samples. We also observe that Y123 magnetization data for temperatures above T_(c) obbey a universal scaling obtained for the diamagnetic fluctuation magnetization from a theory considering non-local field effects. The same scaling was not obbeyed by the corresponding magnetization calculated from the two-dimensional LLL theory.
机译：我们研究了YBa_（2）Cu_（3）O_（7-x），（Y123）具有超导转变温度T_（c）velence62.5、52和41 K的三个单晶，以及一个高度织构化的多晶标本。 （Bi-Pb）_（2）Sr_（2）Ca_（2）Cu_（3）O_（10）（Bi2223），T_（c）velence108K。获得了等温磁场数据，该数据是温度的函数，磁场平行于每个样品的c轴施加。随着磁化趋向于零，所有样品的可逆磁化数据均表现出圆形过渡。可逆数据是根据二维抗磁性最低兰道级（LLL）涨落理论进行解释的。 LLL标度分析得出了各种样品的超导转变温度T_（c）（H）的一致值。由Tesanovic和colaborators获得的二维磁化LLL表达式很好地拟合了所得的比例数据，产生了合理的kappa值，但拟合参数（偏导数）H_（c2）/（偏导数）T产生的值更大比实验确定的我们同时缩放了Y123数据和Bi2223，获得了一条折叠曲线。在将每个缩放曲线的x轴和y轴乘以适当的依赖于样本的缩放因子后，获得单条曲线。从理论上提取了二维x轴LLL缩放的表达式，从而可以将x轴缩放因子的理论值与实验值进行比较。 X轴值之间的比较产生了40％的偏差，这表明所研究的样本不支持二维LLL涨落的普遍性假设。我们还观察到，温度高于T_（c）的Y123磁化数据服从根据考虑非局部场效应的理论获得的抗磁波动磁化的通用标度。从二维LLL理论计算出的相应磁化强度没有遵循相同的比例。

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