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VOLUME 51 (1990) | ISSUE 5 | PAGE 275
Superconducting quantum interferometer based on metal-oxide ceramic in hysteresis-free operation at 77 K
It has been shown experimentally that an rf SQUID can operate even if the energy of the Josephson junction does not exceed the thermal energy. A SQUID of ceramic YBa2Cu3Ox, which has been developed, is capable of hysteresis-free operation in liquid nitrogen and has a noise level less than 3 Χ 10~4ΦοΛ/Ηζ. The parameters of this SQUID have been determined. The roles played by the low-frequency and high-frequency components of thermodynamic fluctuations of the magnetic flux in the SQUID are evaluated on the basis of a resistive model for the Josephson junction.