Thermal fluctuations of the Josephson current in a ring of superconducting grains
- City Univ. of New York (CUNY), NY (United States)
Thermal fluctuations of the Josephson current induced by the magnetic flux through a ring of N superconducting grains are studied. When a half-fluxon is threading the ring, I exhibits incoherent transitions between the two degenerate states due to thermal phase slips. In this study, we propose a numerical method to deal with both equilibrium and dynamic properties of Josephson systems. Computed transition rate has the form Γ = A(N) exp[-B(N)/T ], where B(N) agrees with the analytical result derived for the energy barrier associated with phase slips. In the nondegenerate case (e.g., at a quarter-fluxon) the equilibrium value of I decreases with T due to harmonic excitations and then gets destroyed by phase slips.
- Research Organization:
- City Univ. of New York (CUNY), NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-93ER45487
- OSTI ID:
- 1593722
- Alternate ID(s):
- OSTI ID: 1341269
- Journal Information:
- Physical Review B, Vol. 95, Issue 1; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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