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Quantum dc interference in YBa2Cu3O7-<i>x</i> ceramics at 77 K

A. A. ShabloPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovA. LukashenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovС. И. БондаренкоPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovA. G. BatrakPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Kharkov

Soviet Journal of Low Temperature Physicsjournal1988en

ABI

Annotatsiya

The Josephson effect and quantum dc interference in superconducting ceramics YBa2Cu3O7-x having the superconducting transition temperature of 93 K are investigated experimentally. It is shown that along with the quantum interference observed earlier in multilinked samples of high-Tc superconducting ceramics and ac interference, there also exists a quantum interference in singly coupled samples of superconducting ceramics for direct current, the induction-voltage conversion steepness and the signal-to-noise ratio at 77 K being commensurate with similar characteristics of classical de SQUIDs operating at 4.2 K. It is found from the temperature dependence of the Josephson current in samples of size much larger than the coherence length that weak bonds in ceramics with percolation paths of current are of the S–N–S type.

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Mavzular

Physics of Superconductivity and Magnetism Quantum and electron transport phenomena Magneto-Optical Properties and Applications

Identifikatorlar

DOI: 10.1063/10.0031964

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