Quantum effects and RF-SQUID sensitivity

Fine structure of V <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RF</inf> vs I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RF</inf> dependence of the rf SQUID in the hysteretic mode is investigated experimentally at temperatures from 0.5 to 4.2 K. A suggestion is made that for high resistance point contacts of small capacitance the SQUID sensitivity may be limited by quantum processes for temperatures high enough ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T\simeq4</tex> K). To explain the experimental results macroscopic quantum tunneling and zero-point fluctuations are considered as relevant mechanisms.

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