24 citations · 205 across the 51 of their papers we have counts for
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Universal R-C crossover in current-voltage characteristics for unshunted array of overdamped Nb-AlO_x-Nb Josephson junctions
S. Sergeenkov, V. A. G. Rivera, E. Marega +1
We report on some unusual behavior of the measured current-voltage characteristics (CVC) in artificially prepared two-dimensional unshunted array of overdamped Nb-AlO_x-Nb Josephso…
Unusually strong coherent response from grain-boundary Josephson network in polycrystalline Pr_{x}Y_{1-x}Ba_2Cu_3O_7
V. A. G. Rivera, S. Sergeenkov, C. Stari +4
By applying a highly sensitive homemade AC susceptibility technique to Pr_{x}Y_{1-x}Ba_2Cu_3O_7 polycrystals (with x=0.0, 0.1 and 0.3), we observed very sharp Fraunhofer type low-f…
2D Arrays of Josephson Nanocontacts and Nanogranular Superconductors
Sergei Sergeenkov
By introducing a realistic model of nanogranular superconductors (NGS) based on 2D arrays of Josephson nanocontacts (created by a network of twin-boundary dislocations with strain…
On wireless connection between Josephson qubits
Sergei Sergeenkov, Giacomo Rotoli
By attributing a circulating Josephson current induced diamagnetic moment to a SQUID-type three-level qubit, a wireless connection between such qubits is proposed based only on dip…
Experimental and Theoretical Study on 2D Ordered and 3D Disordered SIS-type Arrays of Josephson Junctions
Fernando M. Araujo-Moreira, Sergei Sergeenkov
By employing mutual-inductance technique and using a high-sensitive bridge, we have thoroughly investigated (both experimentally and theoretically) the temperature and magnetic fie…
Manifestation of vortex depinning transition in nonlinear current-voltage characteristics of polycrystalline superconductor Y_{1-x}Pr_{x}Ba_2Cu_3O_7
V. A. G. Rivera, C. Stari, S. Sergeenkov +2
We present our recent results on the temperature dependence of current-voltage characteristics for polycrystalline Y_{1-x}Pr_{x}Ba_2Cu_3O_7 superconductors with x = 0.0, 0.1 and 0.…
Dislocation induced ac Josephson effect in high-T_c superconductors
Sergei Sergeenkov, Marcel Ausloos
A possible scenario for an ac Josephson effect initiated by the flow of dislocations through a mechanically loaded but electrically unbiased superconductor is proposed. The charact…
Dynamical reentrance and geometry imposed quantization effects in Nb-AlOx-Nb Josephson junction arrays
Fernando M. Araujo-Moreira, Sergei Sergeenkov
In this paper, we report on different phenomena related to the magnetic properties of artificially prepared highly ordered (periodic) two-dimensional Josephson junction arrays (2D-…
Magnetic and transport properties of electron-doped superconducting thin films: Pairing symmetry, pinning and spin fluctuations
S. Sergeenkov, A. J. C. Lanfredi, F. M. Araujo-Moreira
In this Chapter we review our latest results on magnetic (AC susceptibility) and transport (resistivity) properties of Pr1.85Ce0.15CuO4 (PCCO) and Sm1.85Ce0.15CuO4 (SCCO) thin film…
Novel magnetoinductance effects in Josephson Junction Arrays: A single-plaquette approximation
Sergei Sergeenkov
Using a single-plaquette approximation, novel magnetoinductance effects in Josephson junction arrays (JJAs) are predicted, including the appearance of steps in the temperature beha…
Influence of chemical pressure effects on nonlinear thermal conductivity of intrinsically granular superconductors
Sergei Sergeenkov
Using a 2D model of capacitively coupled Josephson junction arrays (created by a network of twin boundary dislocations with strain fields acting as an insulating barrier between ho…
Possible manifestation of spin fluctuations in the temperature behavior of resistivity in Sm_{1.85}Ce_{0.15}CuO_4 thin films
S. Sergeenkov, A. J. C. Lanfredi, F. M. Araujo-Moreira
A pronounced step-like (kink) behavior in the temperature dependence of resistivity is observed in the optimally-doped thin films around $T_{sf}=87…
Irreversibility line and low-field grain-boundary pinning in electron-doped superconducting thin films
S. Sergeenkov, A. J. C. Lanfredi, F. M. Araujo-Moreira
AC magnetic susceptibilities of electron-doped Pr_{1.85}Ce_{0.15}CuO_4 (PCCO) and Sm_{1.85}Ce_{0.15}CuO_4 (SCCO) granular thin films have been measured as a function of temperature…
Thermal expansion of Josephson junctions as an elastic response to an effective stress field
S. Sergeenkov, G. Rotoli, G. Filatrella +1
By introducing a concept of thermal expansion (TE) of a Josephson junction as an elastic response to an effective stress field, we study (both analytically and numerically) the tem…
Influence of structural disorder on low-temperature behavior of penetration depth in electron-doped high-T_C thin films
A. J. C. Lanfredi, S. Sergeenkov, F. M. Araujo-Moreira
To probe the influence of structural disorder on low-temperature behavior of magnetic penetration depth in electron-doped high-T_C superconductors, a comparative study of high-qual…
Probing pairing symmetry of Sm_{1.85}Ce_{0.15}CuO_4 via highly-sensitive voltage measurements: Evidence for strong impurity scattering
A. J. C. Lanfredi, S. Sergeenkov, F. M. Araujo-Moreira
Using a highly-sensitive home-made mutual-inductance technique, temperature profiles of the magnetic penetration depth in the optimally-doped thin…
Magnetic properties of artificially prepared ordered two-dimensional shunted and unshunted Nb-AlO_x-Nb Josephson Junction Arrays
F. M. Araujo-Moreira, S. Sergeenkov
In this Chapter, we present our latest experimental results (along with their theoretical interpretation) related to some unusual magnetic properties of artificially prepared order…
Elastic properties of polycrystalline YBa_2Cu_3O_7: Evidence for granularity induced martensitic behavior
C. Stari, A. Moreno-Gobbi, A. W. Mombru +4
In this work we present the study of the elastic properties of polycrystalline samples of superconducting YBa_2Cu_3O_7 prepared by the sol-gel method. The quality of all samples wa…
Chemically Induced Nanoscale Josephson Effects in Non-Stoichiometric High-Temperature Superconductors
Sergei Sergeenkov
This paper reviews some of the recently suggested (by the author) novel effects expected to occur in intrinsically granular non-stoichiometric material modeled by 2D Josephson junc…
Magnetic field induced polarization effects in intrinsically granular superconductors
Sergei Sergeenkov
Based on the previously suggested model of nanoscale dislocations induced Josephson junctions and their arrays, we study the magnetic field induced electric polarization effects in…
On the origin of reentrance in 2D Josephson Junction Arrays
F. M. Araujo-Moreira, W. Maluf, S. Sergeenkov
A comparative study of the magnetic properties of shunted and unshunted two-dimensional Josephson junction arrays (2D-JJA) is presented. Using a single-plaquette approximation of t…
Influence of nonuniform critical current density profile on magnetic field behavior of AC susceptibility in 2D Josephson Junction Arrays
F. M. Araujo-Moreira, W. Maluf, S. Sergeenkov
Employing mutual-inductance measurements we study the magnetic field dependence of complex AC susceptibility of artificially prepared highly ordered (periodic) two-dimensional Jose…
Higher harmonics of ac voltage response in narrow strips of YBa2Cu3O7 thin films: Evidence for strong thermal fluctuations
J. G. Ossandon, S. Sergeenkov, P. Esquinazi +1
We report on measurements of higher harmonics of the ac voltage response in strips of YBa2Cu3O7 thin films as a function of temperature, frequency and ac current amplitude. The thi…
Manifestation of geometric quantization effects in temperature behavior of AC magnetic response of Josephson Junction Arrays
S. Sergeenkov, F. M. Araujo-Moreira
By improving resolution of home-made mutual-inductance measurements technique, a pronounced step-like structure (with the number of steps n=4 for all AC fields) has been observed i…