TY - JOUR
T1 - Thermodynamics of two-dimensional josephson junctions
AU - Horovitz, B.
AU - Golub, A.
AU - Sonin, E. B.
AU - Zaikin, A. D.
PY - 1994/3/20
Y1 - 1994/3/20
N2 - We derive the effective free energy of a two-dimensional Josephson junction in the presence of an external current and predict that the junction has a phase transition at a temperature TJ below the bulk transition temperature Tc. In the range TJ < T < Tc long-range phase correlation exists in the bulk, but is destroyed in the vicinity of the junction. The critical current Ic is reduced by thermal fluctuations, for a junction of size L, Ic∼ Lb(T) where b(T) < 0 for TJ < T < Tc (i.e. Ic vanishes at L→∞) while 0 < b(T) < 2 for T < TJ. Our results may account for the absence of an observable supercurrent at temperatures below Tc in YBa2Cu3Ox- and Bi2Sr2CaCu2O8-based junctions.
AB - We derive the effective free energy of a two-dimensional Josephson junction in the presence of an external current and predict that the junction has a phase transition at a temperature TJ below the bulk transition temperature Tc. In the range TJ < T < Tc long-range phase correlation exists in the bulk, but is destroyed in the vicinity of the junction. The critical current Ic is reduced by thermal fluctuations, for a junction of size L, Ic∼ Lb(T) where b(T) < 0 for TJ < T < Tc (i.e. Ic vanishes at L→∞) while 0 < b(T) < 2 for T < TJ. Our results may account for the absence of an observable supercurrent at temperatures below Tc in YBa2Cu3Ox- and Bi2Sr2CaCu2O8-based junctions.
UR - http://www.scopus.com/inward/record.url?scp=84957349464&partnerID=8YFLogxK
U2 - 10.1209/0295-5075/25/9/011
DO - 10.1209/0295-5075/25/9/011
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AN - SCOPUS:84957349464
SN - 0295-5075
VL - 25
SP - 699
EP - 704
JO - Lettere Al Nuovo Cimento
JF - Lettere Al Nuovo Cimento
IS - 9
ER -