Temperature dependence of the critical current in high-Tc superconductors

J. Aponte; H. C. Abache; A. Sa-Neto; M. Octavio

doi:10.1103/PhysRevB.39.2233

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Temperature dependence of the critical current in high-Tc superconductors

J. Aponte, H. C. Abache, A. Sa-Neto, M. Octavio

DOI 10.1103/PhysRevB.39.2233 · Physical Review B

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Abstract

We present a study of the temperature dependence of the critical current in bulk samples of the high-Tc superconductors Y-Ba-Cu-O and Dy-Ba-Cu-O. We have found that the critical current varies linearly with (Tc−T). This result suggests a percolating network of Josephson-coupled superconducting grains. However, the critical current versus temperature curves are found to have a nonlinear tail close to the critical temperature. We have determined that the temperature at which the Ic vs T curves depart from the linear behavior in our samples agrees with what is expected according to theoretical models of granular superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	onset
DyBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown
Y1.2Ba0.8Cu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	82	Pressure not reported	onset