Low-temperature critical current of Y1-xCaxBa2Cu3O7-delta thin films as a function of hole content and oxygen deficiency

Abstract

The effects of hole content (p) and oxygen deficiency (delta) on the zero-field critical current density, Jc0, were investigated for high-quality c-axis oriented Y1-xCaxBa2Cu3O7-delta (x = 0, 0.05, 0.10, and 0.20) thin films. Ca was used to introduce hole carriers in the CuO2 planes, independent of the oxygen deficiency in the CuO1-delta chains. Low-temperature Jc0(16K) of these films above the optimum doping were found to be high (> 10^7 Amp/cm^2) and were primarily determined by the hole concentration, reaching a maximum at p ~ 0.185+/-0.005, irrespective of oxygen deficiency. This implies that oxygen disorder plays only a secondary role and the intrinsic Jc0 is mainly governed by the carrier concentration and consequently by the superconducting condensation energy which also peaks at p ~ 0.19 where the pseudogap correlation vanishes.

References in corpus (7)

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• The Doping Phase Diagram of Y1-xcaxba2(Cu1-yzny)3O7-d from Transport Measurements: Tracking the Pseudogap Below Tc (y = 0)
• Factors affecting the Optimal Design of High-Tc Superconductors - the Pseudogap and Critical Currents
• Hole Doping Dependence of the Coherence Length in $L{a}_{2-x}S{r}_{x}Cu{O}_4$ Thin Films
• Structural and electrical properties of c-axis oriented Y1-xCaxBa2(Cu1-yZny)3O7-delta thin films grown by pulsed laser deposition
• Doping Dependence of the Critical Current and Irreversibility Field in Y1-xCaxBa2Cu3O7-delta

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• Interrelations among critical current density, irreversibility field and pseudogap in hole doped high-Tc cuprates
• Structural, electrical, magnetic, and flux pinning properties of YBCO/Ni superconducting composites: analyses and possible explanations
• Effects of Zn on the grain boundary properties of La2-xSrxCu1-yZnyO4 superconductors
• Critical current density of hole doped high-Tc cuprates and heavy fermion superconductors: relevance to the possible quantum critical behavior
• Estimation of Cooper pair density and its relation to the critical current density in hole doped high-Tc cuprate superconductors