Phys. Rev. Lett. 90, 047003 (2003) [4 pages]Quantum Tunneling between Paramagnetic and Superconducting States of a Nanometer-Scale Superconducting Grain Placed in a Magnetic FieldReceived 5 August 2002; revised 29 October 2002; published 28 January 2003 We consider the process of quantum tunneling between the superconducting and paramagnetic states of a nanometer-scale superconducting grain placed in a magnetic field. The grain is supposed to be weakly coupled to a normal metallic contact that plays the role of the spin reservoir. Using the instanton method, we find the probability of the quantum tunneling process and express it in terms of the applied magnetic field, order parameter of the superconducting grain, and conductance of the tunneling junction between the grain and metallic contact. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.047003
DOI:
10.1103/PhysRevLett.90.047003
PACS:
74.50.+r, 73.23.–b, 73.63.–b, 74.40.+k
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