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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskii A. A., Popkov S. I., Gokhfeld D. M., Semenov S. V., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Specific features in the hysteretic behavior of the magnetoresistance of granular high-temperature superconductors
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 11. - P.2155-2164. - ISSN 1063-7834, DOI 10.1134/S1063783412110030
Примечания : Cited References: 52. - This study was supported by the Russian Foundation for Basic Research within the framework of the Regional Competition SIBERIA (project no. 11-02-98007 r-sibir'_a).
Предметные рубрики: CURRENT-VOLTAGE CHARACTERISTICS
WEAK MAGNETIC-FIELDS
CRITICAL-CURRENT DENSITY
T-C SUPERCONDUCTORS
ANGULAR-DEPENDENCE
JOSEPHSON MEDIUM
TRANSPORT-PROPERTIES
CRITICAL-STATE
YBa2Cu3O7-DELTA
COMPOSITES
Аннотация: The behavior of the hysteresis of the magnetoresistance R(H) of granular high-temperature superconductors has been investigated under the conditions where the resistive response of the subsystem of grain boundaries close to saturation. The hysteretic dependences R(H) have been measured for Y1-xPrxBa2Cu3O7 samples at x = 0.11 and 0.04 with the transition temperatures T-C approximate to 85.5 and 91.0 K, respectively. The evolution of the field width of the hysteresis R(H) has been examined by varying the measuring current. The limit of the applicability has been established for the concept of the effective field in the intergranular medium, which was previously proposed for the description of the hysteretic behavior of the magnetoresistance R(H) and thermal magnetic prehistory of the granular high-temperature superconductors. In the studied samples, the approximation of the effective field in the intergranular medium is applicable until the magnetoresistance of the subsystem of grain boundaries exceeds (90 +/- 5)% of the maximum value.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Sutormin V. S., Myslivets S. A., Shabanov V. F., Zyryanov V. Ya.
Заглавие : Synchronously controlled optical modes in the transmittance and reflectance spectra of multilayer photonic structure with dual-frequency nematic liquid crystal
Место публикации : Phys. Rev. E. - 2022. - Vol. 105, Is. 2. - Ст.024702. - ISSN 2470-0045, DOI 10.1103/PhysRevE.105.024702. - ISSN 2470-0053(eISSN)
Примечания : Cited References: 31
Предметные рубрики: ANGULAR-DEPENDENCE
DEFECT MODES
FILTER
TRANSMISSION
MODULATION
Аннотация: A method for electrically controlled synchronous mode tuning in the transmittance and reflectance spectra of a photonic structure consisting of an asymmetric dielectric Fabry-Perot microcavity and an ultrathin metallic film has been proposed. The excitation of a broadband Tamm plasmon polariton at a metal/Bragg mirror interface is accompanied by the two phenomena opposing one another. Due to the strong absorption induced by the metal, a sufficient rejection level in the reflection of the off-resonant radiation has been obtained in a wide spectral range, which almost coincides with the photonic band gap, while at the cavity mode frequencies the structure becomes transparent for the reflected radiation. This leads to the appearance of a series of narrow resonance peaks in the reflectance spectra that coincide in frequency with the transmittance peaks. Based on the structural transformations in the dual-frequency nematic liquid crystal used as a photonic structure defect, the tuning of the modes corresponding to the extraordinary waves to both the short- and long-wavelength spectral ranges has been implemented.
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