Volume 115, Number 2, July 2016
|Number of page(s)||5|
|Published online||16 August 2016|
Shapiro step at nonequilibrium conditions
1 BLTP, JINR - Dubna, Moscow Region, 141980, Russia
2 State University of Nature, Society and Man “Dubna” - Dubna, Moscow region, 141980, Russia
3 Department of Physics, Cairo University - Cairo, Egypt
4 Department of Physics, Faculty of Science, Menoufiya University - Menoufiya, Egypt
Received: 19 March 2016
Accepted: 25 July 2016
Detailed numerical simulations of intrinsic Josephson junctions of high-temperature superconductors under external electromagnetic radiation are performed taking into account a charge imbalance effect. We demonstrate that the charge imbalance is responsible for a slope in the Shapiro step in the IV-characteristic. The value of slope increases with a nonequilibrium parameter. Coupling between junctions leads to the distribution of the slope's values along the stack. The nonperiodic boundary conditions shift the Shapiro step from the canonical position determined by , where f is a frequency of external radiation. This fact makes the interpretation of the experimentally found Shapiro step shift by the charge imbalance effect ambiguous.
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations / 05.70.Ln – Nonequilibrium and irreversible thermodynamics
© EPLA, 2016
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