Abstract
Below the critical temperature, several Ce substituted YBa2Cu3O7−δ superconductors exhibit nonlinear current–voltage (IV) characteristics. We have extracted an exponent following the idea of the Kosterlitz–Thouless transition using IV over a wide range of temperatures around the critical temperature. The superfluid phase stiffness has been extracted within the framework of the Ambegaokar–Halperin–Nelson–Siggia theory. In a combined plot of the superfluid density and resistivity as a function of temperature, we observe that the superfluid density varies widely corresponding to the zero resistive states. The shift of the temperature corresponding to the crossing point with the electron doping level has been found to be very strong.
Highlights
The superfluid density in a superconducting system affects both the critical temperature and the critical current density
We have explored the possibility of the KT transition in electron doped YBCO superconductors
We have extracted a crossover temperature above which the suppression of the superfluid phase stiffness and the increase in resistivity have been studied in all electron doped YBCO superconductors
Summary
The superfluid density in a superconducting system affects both the critical temperature and the critical current density. A nonlinear relation between the superfluid density and the critical temperature has been observed in numerous cuprate superconducting systems. The variation of the superfluid density with the temperature in the superconducting state is very important to understand the superconducting phase transition and the possibility of the Kosterlitz–Thouless (KT) transition in HTS.. By measuring the transport properties in electron doped superconducting systems, it is possible to understand the variation of the superfluid density as a function of temperature.. The determination of the superfluid phase stiffness has been done by using the nonlinear nature of the IV curves obtained below the critical temperature by following the Ambegaokar–Halperin–Nelson–Siggia (AHNS) theory.. We have extracted a crossover temperature above which the suppression of the superfluid phase stiffness and the increase in resistivity have been studied in all electron doped YBCO superconductors
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