Abstract
Thermally activated flux motion and specific electric resistance in Y358 were studied under different magnetic fields ranging from 0 to 15 kOe. Through investigating the broadening of normal-superconducting transition, we found that the thermally-activated-flux-motion model can describe the electronic effect near the superconducting transition temperature. By modifying this model, specific electric resistance at different magnetic fields was calculated.
Highlights
Wu et al [1] discovered a new compound, YBa2Cu3O7 or Y123, of the YBCO family withTc = 92 K—above the liquid-nitrogen temperature—which was composed of copper-oxide layers
Various models have been devised to analyze the broadening of electric-resistance transition region below the transition temperature of high-Tc superconductors under different magnetic fields
In some high-Tc superconductors, a good fit has been observed by employing the Ambegaokar-Halperin (AH) model [6]
Summary
Wu et al [1] discovered a new compound, YBa2Cu3O7 or Y123, of the YBCO family with. Tc = 92 K—above the liquid-nitrogen temperature—which was composed of copper-oxide layers. Y358 (Y3Ba5Cu8O18) has been recently synthesized, with a transition temperature of about 2 K higher than that of Y123 [4,5]. This compound consists of five CuO2 layers and three CuO chains in the unit cell. Various models have been devised to analyze the broadening of electric-resistance transition region below the transition temperature of high-Tc superconductors under different magnetic fields. The flux-creep model, flux-flow model, and the model of phase slip, which results from fluctuations in superconductor order parameters, are being utilized to explain the broadening of specific-resistance transition in high-Tc superconductors under a magnetic field. We studied the magnetic properties and flux dynamics in Y358 through a TAFC model
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