Abstract
A dissipative phase transition (DPT) is found in resistively shunted (4– 75 kΩ ) mesoscopic Josephson junctions owing to suppression of macroscopic quantum tunneling of phase by the interaction with dissipative quantum-mechanical environment. We have studied the behavior of this transition as a function of magnetic field. Instead of a field-induced insulator-superconductor transition, we find a hysteretic insulator–insulator (I–I) transition. The phase diagram for the DPT in a weak magnetic field is outlined.
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