Magnetoresistance quantization in high-Tc thin films radiating microwaves

doi:10.1016/0921-4534(91)90664-K

Physica C: Superconductivity

Volume 180, Issues 1–4, September 1991, Pages 192-195

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Abstract

Magnetoresistance of granular YBaCuO films biased with a dc current, which causes a pronounced emission of electromagnetic energy in the microwave region, exhibits quantum effects in varying external dc magnetic field. The model relating the observed flux-flow resistance phenomena to the synchronization of radiating intrinsic Josephson junctions by viscous flow of vortices across radiating multi-loop clusters is proposed and discussed. Magnetoresistance experiments enabled the determination of the viscosity for the flux-flow and evaluation of the effective parameters for the high-Tc Josephson medium.

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Cited by (1)

Flux trapping in high-temperature superconductors determined by microwave absorption
1992, Physica C: Superconductivity and its applications
Low-field microwave absorption has been applied for monitoring magnetic flux trapping in a ceramic sample of YBa₂Cu₃O_6.9 in the presence of a microwave field. Magnetic field trapping is strongly dependent on the texture of a superconducting sample. On cooling of the sample in a magnetic field, the magnetic flux is observed to reach a saturated value. The observed phenomena are discussed in terms of the model of intergrain Josephson junctions where dissipation of energy takes place and is a source of microwave absorption. The proposed method is an important complement to classical methods of magnetization investigation, as it permits studies of the local distribution of magnetic flux trapped in a superconducting sample.

^∗: Present address: Electrical Engineering Department, University of Duisburg, 4100 Duisburg, Germany

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Magnetoresistance quantization in high-Tc thin films radiating microwaves

Abstract

Europhys. Lett.

Europhys. Lett.

J. Appl. Phys.