Quantum phase transitions in one-dimensional long Josephson junction stacks in parallel magnetic fields

Ju H. Kim

doi:10.1103/PhysRevB.65.100509

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Quantum phase transitions in one-dimensional long Josephson junction stacks in parallel magnetic fields

Ju H. Kim

DOI 10.1103/PhysRevB.65.100509 · Physical Review B

T1

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Abstract

We report the effect of quantum and thermal fluctuations on stability of mutual phase locking in one-dimensional long Josephson junction devices, involving layered superconductors. Accounting for both the induction coupling and the charging effect, we determined the zero-temperature (T=0) phase diagram, using renormalization-group analysis, and found that the in-phase mode is stable, but some out-of-phase modes are unstable against quantum fluctuations. At finite T, all stable phase-locking modes (at T=0) are unstable, but stability is still maintained within a finite length, which decreases inversely with T. In Bi2Sr2CaCu2O8+y, this length for the in-phase mode is roughly 1000 μm at 1 K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown