Phase-slip mechanism for dissipation in high-Tc superconductors
A. C. Wright, T. K. Xia, A. Erbil
DOI 10.1103/PhysRevB.45.5607 · Physical Review B
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Abstract
The phase-slip theory of Ambegaokar and Halperin (AH) is used to explain measurements of magnetoresistance versus temperature for a granular high-Tc superconducting material, assuming an array of Josephson weak links. Results of experiments are compared to dynamical calculations of the critical current versus magnetic field in a Josephson-junction array at non-zero temperatures. The AH theory is able to account for the observed dissipation, give physical insight into the role played by the sample microstructure, and also quantitatively explain the kink in the magnetoresistance curve seen to occur in both granular and single-crystal materials. Furthermore, within this framework, the critical current for a particular sample is determined from magnetoresistance measurements, and then used to calculate the temperature dependence of the ac magnetic susceptibility. Comparison of the calculated real and imaginary components is made to direct measurements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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