Abstract
We report here the fluctuation induced excess conductivity and IR spectra in Bi2Sr2Ca1-xYxCu2Oy (0.00 < x < 0.50) superconductors. This work is done by using the reported data of Sedky, Physica B 410, 227 (2013), and with the help of Anderson and Zou relation. The logarithmic plots of excess conductivity ∆σ and reduced temperature Є reveal two different exponents corresponding to unique crossover temperature in the slope of each plot. The first exponent is obtained in the normal field region at a temperature of ( << T < 2 ), while the second exponent is obtained in the mean field region at a temperature of (T ~ ). The dimensional exponents are shifted from three dimensional (3D) to two dimensional (2D) for x < 0.30, but it is shifted from 2D to 3D for x = 0.50. Both zero kelvin critical magnetic fields and current density are considerably enhanced by increasing x up to 0.30 followed by a decrease with further increase of x up to 0.50. The vice is versa for the behavior of interlayer coupling, coherence lengths and anisotropy against x. On the other hand, IR spectra show absorption modes in the wave number range of 716-726 cm-1 according to the value of x. These results are discussed in terms of the correlation between carrier concentration, oxygen deficient and effective Cu valance which are induced by Y through CuO2 planes of BSCCO superconductors.
Highlights
IntroductionThe high temperature superconductors have a layered structure in which two dimensional conducting CuO2 planes are separated by Bi charge reservoir layers, which impede the movement of carriers normal to the conducting planes [1,2,3,4,5,6,7]
The high temperature superconductors have a layered structure in which two dimensional conducting CuO2 planes are separated by Bi charge reservoir layers, which impede the movement of carriers normal to the conducting planes [1,2,3,4,5,6,7]. These types of materials exhibit anisotropy and small coherence length together with elevated values of critical temperature Tc. These materials have a significant effect on the fluctuations of superconducting order parameter, which have been early observed in the conductivity versus temperature measurements as excess conductivity
The fluctuation induced conductivity (FIC) analyses reveal that the contribution of excess conductivity is due to Gaussian fluctuation in the mean field region as well as the critical fluctuation region [11]
Summary
The high temperature superconductors have a layered structure in which two dimensional conducting CuO2 planes are separated by Bi charge reservoir layers, which impede the movement of carriers normal to the conducting planes [1,2,3,4,5,6,7] These types of materials exhibit anisotropy and small coherence length together with elevated values of critical temperature Tc. In particular, these types of materials exhibit anisotropy and small coherence length together with elevated values of critical temperature Tc These materials have a significant effect on the fluctuations of superconducting order parameter, which have been early observed in the conductivity versus temperature measurements as excess conductivity. The IR spectra are taken in the frequency range from 40800 cm-1 and the results are compared with the excess conductivity analysis
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