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Quantum interference in high-temperature superconductors

B. I. VerkinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovI. M. DmitrenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. M. DmitrievPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. V. KartsovnikPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. G. Kozyr’Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. A. PavlyukPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovG. M. TsoĭPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. I. ShnyrkovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI

Abstract

The physical information obtained from inductive measurements of superconducting transitions in ceramic samples is analyzed and possible parameters for rf squids at liquid nitrogen temperatures are estimated. Intrinsic fluctuations of magnetic flux in superconducting ceramics, which are responsible for excessive noise in quantum interferometers, are reported.

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