9 citations · 46 across the 7 of their papers we have counts for
7 papers
Pinning of spiral fluxons by giant screw dislocations in YBa_2Cu_3O_7 single crystals: Josephson analog of the fishtail effect
S. Sergeenkov, L. Jr. Cichetto, V. A. G. Rivera +4
By using a highly sensitive homemade AC magnetic susceptibility technique, the magnetic flux penetration has been measured in YBa_2Cu_3O_7 single crystals with giant screw dislocat…
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…
Manifestation of geometric resonance in current dependence of AC susceptibility for unshunted array of Nb-AlOx-Nb Josephson junctions
V. A. G. Rivera, S. Sergeenkov, E. Marega +1
A pronounced resonance-like structure has been observed in the current dependence of AC susceptibility for two-dimensional array of unshunted Nb-AlOx-Nb Josephson junctions. Using…
Temperature oscillations of magnetization observed in nanofluid ferromagnetic graphite
S. Sergeenkov, N. S. Souza, C. Speglich +5
We report on unusual magnetic properties observed in the nanofluid room-temperature ferromagnetic graphite (with an average particle size of l=10nm). More precisely, the measured m…
Manifestation of finite temperature size effects in nanogranular magnetic graphite
S. Sergeenkov, N. S. Souza, C. Speglich +5
In addition to the double phase transition (with the Curie temperatures T_C=300K and T_{Ct}=144K), a low-temperature anomaly in the dependence of the magnetization is observed in t…
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…