Temperature-dependent phase reversal of nonresonant microwave and rf absorption in high-Tc superconductors

S. V. Bhat; V. V. Srinivasu; N. Kumar

doi:10.1103/PhysRevB.44.10121

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Temperature-dependent phase reversal of nonresonant microwave and rf absorption in high-Tc superconductors

S. V. Bhat, V. V. Srinivasu, N. Kumar

DOI 10.1103/PhysRevB.44.10121 · Physical Review B

T1

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Abstract

The phenomenon of temperature-dependent phase reversal of the nonresonant electromagnetic response of the high-Tc superconductors is studied in the rf and the microwave ranges. Phase reversal is the changeover from a maximum at zero magnetic field and the decrease with the increasing field to a minimum at zero field and the increase with the increasing field. The results are analyzed using an effective-medium theory, treating the sample as a percolating network consisting of the superconducting regions separated by normal metallic regions. The experimental observations are shown to follow naturally from the dependence of the superconducting fraction on the temperature and the magnetic field.

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.	84	Pressure not reported	onset
BiSrCaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	84.5	Pressure not reported	onset