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SCALING OF THE SUPERCONDUCTING ORDER PARAMETER IN BI CUPRATES WITH T-C

机译：具有T-C的BI容器中超导阶参数的缩放

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Tunneling measurements have been carried out by the point-contact technique on four members of the Bi cuprates: on the (Bi,Pb)(2)Sr2Ca2Cu3O10+x (2223), Bi2Y0.1Sr1.9CaCu2O8+x (Y2212), Bi2.1Sr1.9CaCu2O8+x (2212) superconductors at 4.2 K and on Bi2.07Sr1.8CuO6+x (2201) at 2 K. The polycrystalline samples have the critical temperature T-c = 108 K, 94 K, 85 K and 7 K, respectively. All measured tunneling spectra (tunneling conductance versus the bias voltage) reveal a significant reduction below a certain voltage indicating the superconducting gap edge. The BCS-like formula for the superconducting density of states accounting for some additional smearing can successfully fit the experimental data, particularly at the gap position. Discrepancies found at lower voltages inside the gap may indicate a possible anisotropy of the order parameter, but an extrinsic origin (like inhomogenity in the sample, irregularities in the tunnel barrier) is possible as well. The obtained values of the reduced superconducting energy gap 2 Delta/k(B)T(c) amount to 6-7 for all four systems. Consequently, our results found the gap Delta scaling with the transition temperature T-c in the Bi cuprates. [References: 18]
机译：已通过点接触技术对Bi铜酸盐的四个成员进行了隧穿测量：在（Bi，Pb）（2）Sr2Ca2Cu3O10 + x（2223），Bi2Y0.1Sr1.9CaCu2O8 + x（Y2212）和Bi2上。 1Sr1.9CaCu2O8 + x（2212）超导体在4.2 K时和Bi2.07Sr1.8CuO6 + x（2201）在2 K时。多晶样品的临界温度分别为Tc = 108 K，94 K，85 K和7 K 。所有测得的隧穿光谱（隧穿电导与偏置电压）都显示出低于某个电压的明显降低，这表明超导间隙边缘。类似于BCS的状态的超导密度公式，说明了一些额外的拖尾现象，可以成功地拟合实验数据，尤其是在间隙位置。在间隙内较低电压处发现的差异可能表明有序参数可能存在各向异性，但也可能是非本征源（如样品中的不均匀性，隧道势垒中的不规则性）。对于所有四个系统，减小的超导能隙2 Delta / k（B）T（c）的获得值总计为6-7。因此，我们的结果发现Bi铜酸盐中间隙Delta随过渡温度T-c的变化而变化。 [参考：18]

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