Speaker
Mr
Kirill Kulikov
(BLTP)
Description
Nonequilibrium effects in layered superconducting materials that appears as a result of injection of a stationary current are actively studied in recent years [1,2,3]. An experimental proof of the existence of a nonequilibrium effect in intrinsic Josephson junctions was given in [4] and was explained by the charge imbalance in the superconducting layers, which arises as the result of injection of the quasiparticle current.
In our work, we provide a detailed numerical simulations of intrinsic Josephson junctions of high temperature superconductors under external electromagnetic radiation taking into account the charge imbalance effect [5]. We demonstrate that the charge imbalance is responsible for a slope of the Shapiro steps on the current-voltage characteristic. The value of slope increases with a nonequilibrium parameter. Coupling between junctions leads to a distribution of the slope's values along the stack. The nonperiodic boundary conditions shift the Shapiro step from the canonical position determined by a frequency of external radiation. This fact makes ambiguous the interpretation of the experimentally found Shapiro step shift by the charge imbalance effect [6].
1. S. Artemenko and A. Kobelkov, PRL 78, 3551 (1996)
2. C. Helm, L.N. Bulaevskii, E.M. Chudnovsky and M.P. Maley, PRL 89, 057003 (2002)
3. Yu.M. Shukrinov and M.A. Gaafar, PRB 84, 094514 (2011)
4. D.A. Ryndyk, PRL 80, 3376 (1998)
5. Yu. M. Shukrinov, M. Nashaat, K. V. Kulikov, R. Dawood, H. El Samman and Th. M. El Sherbini, EPL 115, 20003 (2016)
6. S. Rother, Y. Koval, P. Müller, R. Kleiner, D.A. Ryndyk, J. Keller and C. Helm, PRB 67, 024510 (2003)
Primary author
Mr
Kirill Kulikov
(BLTP)
Co-authors
Dr
Hussein El Samman
(Department of Physics, Faculty of Science, Menoufiya University)
Mr
Majed Nashaat
(Department of Physics, Cairo University)
Mrs
Radva Dawood
(Department of Physics, Cairo University)
Dr
Tharwat El Sherbini
(Department of Physics, Cairo University)
Prof.
Yury Shukrinov
(BLTP JINR)
