S 68 Smolyak, B. M. ZFC-, FC- and Rem- susceptibility of granular superconductors [Text] / B. M. Smolyak, E. V. Postrekhin, G. V. Ermakov // Superconductor Science and Technology. - 1994. - V. 7. - P427-433 Рубрики: ФИЗИКА Кл.слова (ненормированные): ZFC-ЧУВСТВИТЕЛЬНОСТЬ -- FC-ЧУВСТВИТЕЛЬНОСТЬ -- Rem-ЧУВСТВИТЕЛЬНОСТЬ -- СВЕРХПРОВОДНИКИ ЗЕРНИСТЫЕ -- ЗЕРНИСТЫЕ СВЕРХПРОВОДНИКИ -- ТЕПЛОФИЗИКА |
R 35 Regular and chaotic thermal oscillations in current-carrying thin HTSC films [Text] / V. N. Skokov, V. P. Koverda, V. B. Ivakin, N. M. Semenova // Journal of Physics D. Applied Physics. - 1996. - V. 29, №3. - P843-847 Рубрики: ФИЗИКА Кл.слова (ненормированные): КОЛЕБАНИЯ РЕГУЛЯРНЫЕ -- РЕГУЛЯРНЫЕ КОЛЕБАНИЯ -- КОЛЕБАНИЯ ХАОТИЧЕСКИЕ -- ХАОТИЧЕСКИЕ КОЛЕБАНИЯ -- HTSC ПЛЕНКИ ПОТОКОНЕСУЩИЕ -- ПОТОКОНЕСУЩИЕ ПЛЕНКИ -- ПЛЕНКИ HTSC -- КОЛЕБАНИЯ ТЕРМИЧЕСКИЕ -- ТЕРМИЧЕСКИЕ КОЛЕБАНИЯ -- HTSC ПЛЕНКИ ТОНКИЕ -- ТОНКИЕ ПЛЕНКИ -- ПЛЕНКИ HTSC -- ТЕПЛОФИЗИКА Аннотация: We present the results of an experimental study of the dynamics of thermal self-oscillations of a normal zone in thin films of high-temperature superconductors (HTSC) connected to an external circuit with an inductance and cooled by boiling nitrogen. The response of the system to a harmonic driving force has been studied. Spectral and dynamical characteristics of various oscillative regimes have been determined. It is shown there arises a state of a deterministic chaos in some range of driving frequencies and amplitudes. An effective of synchronization of periodic self-oscillations of a normal zone and thermo-hydrodynamical oscillations caused by the boiling of liquid nitrogen near a film surface has been recognized |
S 66 Skokov, V. N. Waves and 1-f noise in two-phase liquid-vapor system under Joule self-heating of high-temperature superconductors in boiling nitrogen [Text] / V. N. Skokov, V. P. Koverda // Waves in two-phase tlows: Euroment Colloquium 376 (April 27-30 1998):Instanbul. Book of Abstracts. - 1998. - P87-88 Рубрики: ФИЗИКА Кл.слова (ненормированные): ВОЛНЫ -- СИСТЕМА ЖИДКОСТЬ-ПАР -- САМОРАЗОГРЕВ ДЖОУЛЯ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ -- ВЫСОКОТЕМПЕРАТУРНЫЕ СВЕРХПРОВОДНИКИ -- НИТРОГЕН КИПЯЩИЙ -- 1/f-ШУМ -- ТЕПЛОФИЗИКА -- КОЛЛОКВИУМЫ -- РЕФЕРАТЫ |
S 66 Skokov, V. N. An experimental study of 1/f-fluctuations at nonequilibrium first-order phase transitions under joule selfheating of high-temperature superconductors cooled by boiling nitrogen [Text] / V. N. Skokov, V. P. Koverda // Nucleation and Non-linear Prolems in the First-Order Phase Transitions (NPT'98): Final Programme and Book of Abstracts: First Int. Workshop (St. Peterburg, Pussia, 29 June - 3 July 1998). - 1998. - P45-46 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПЕРЕХОД НЕРАВНОВЕСНЫЙ -- неравновесные переходы -- ПЕРЕХОД ФАЗОВЫЙ I РОДА -- САМОРАЗОГРЕВ ДЖОУЛЯ -- ДЖОУЛЯ САМОРАЗОГРЕВ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ -- ВЫСОКОТЕМПЕРАТУРНЫЕ СВЕРХПРОВОДНИКИ -- АЗОТ КИПЯЩИЙ -- КИПЯЩИЙ АЗОТ -- АЗОТ -- N |
T 44 The effect of an Alternating Magnetic-Field on the Stability of Hard Levitation of High-Temperature Superconductors [Text] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov, E. V. Postrekhin, L. M. Shou, I. B. Smolyak, S. V. Naumov // Materials Science and Engineering B. Solid State Materials for Advanced Technology. - 1998. - V. 53, Iss. 1-2. - P177-181 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПОЛЕ МАГНИТНОЕ -- ПОЛЕ ПЕРЕМЕННОЕ -- ЛЕВИТАЦИЯ ТЯЖЕЛАЯ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ |
T 44 The Instability of Levitation of High-Temperature Superconductors Subject to an Alternating Magnetic-Field [Text] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov, I. B. Smolyak, S. V. Naumov // Physica A. - 1998. - V. 302, Iss. 1. - P23-30 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПОЛЕ МАГНИТНОЕ -- МАГНИТНОЕ ПОЛЕ -- ПОЛЕ ПЕРЕМЕННОЕ -- ПЕРЕМЕННОЕ ПОЛЕ -- ЛЕВИТАЦИЯ -- НЕУСТОЙЧИВОСТЬ ЛЕВИТАЦИИ -- ЛЕВИТАЦИИ НЕУСТОЙЧИВОСТЬ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ -- ВЫСОКОТЕМПЕРАТУРНЫЕ СВЕРХПРОВОДНИКИ |
S 68 Smolyak, B. M. The paramagnetic effect of clusters in granular superconductors under the Meissner magnetization [Text] / B. M. Smolyak, G. V. Ermakov // Journal of Magnetism and Magnetic Materials. - 1996. - Vol. 153, № 3. - P311-314 Рубрики: ФИЗИКА Кл.слова (ненормированные): ЭФФЕКТ ПАРАМАГНИТНЫЙ -- ПУЧКИ СВЕРХПРОВОДНИКОВ -- СВЕРХПРОВОДНИК ГРАНУЛИРОВАННЫЙ -- НАМАГНИЧЕННОСТЬ МЕЙСНЕРА |
S 66 Skokov, V. N. Characteristics of chaotic vibrations of normal zone in thin films of high-temperature superconductors [] / V. N. Skokov, V. B. Ivakin, V. P. Koverda // Pisma V Zhurnal Teknicheskoi Fiziki. - 1995. - V.21, Is.16. - С. 37-43 Рубрики: ФИЗИКА Кл.слова (ненормированные): CHAOTIC VIBRATIONS |
S 68 Smolyak, B. M. Influence of a variable magnetic field on the stability of the magnetic suspension of high-T-c superconductors [] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov // Technical Physics. - 1997. - V.42, Is.12. - С. 1455-1456 Рубрики: ФИЗИКА Кл.слова (ненормированные): FIELD VARIABLE -- FIELD MAGNETIC -- SUSPENSION MAGNETIC -- SUPERCONDUCTORS HIGH-T-C -- LEVITATION -- COLLAPSE -- AMPLITUDE CRITICAL -- FREQUENCY Аннотация: The resonant oscillation of superconductors by a variable magnetic held during hard levitation and the collapse of levitation are investigated. The critical amplitude and the frequency of the variable held are calculated \\\\Expert2\\NBO\\Technical Physics\\1997, v.42, N 12, p.1455.pdf |
S 68 Smolyak, B. M. Retardation of the Magnetic Relaxation in High-Temperature Superconductors Near a Ferromagnet / B. M. Smolyak, G. V. Ermakov, M. S. Zakharov // Journal of Superconductivity and Novel Magnetism. - 2011. - Vol.24, №1-2. - С. 325-329 Рубрики: ФИЗИКА Кл.слова (ненормированные): HIGH-T C SUPERCONDUCTORS -- TRAPPED FLUX -- MAGNETIC RELAXATION Аннотация: The creep of a magnetic flux trapped in a bulk high-temperature superconductor has been studied. It has been found that the magnetic relaxation is retarded when the superconductor is placed near a ferromagnet. The value of the retardation effect depends on the sequence of magnetization and the approach of the superconductor to a ferromagnet. The magnetic relaxation is fully suppressed when a superconducting sample first is magnetized and then is brought close to a ferromagnet. An interpretation of this effect has been discussed. Being magnetized, a ferromagnet produces its own magnetic field. While penetrating into a disk sample through its planes, the ferromagnet field induces screening currents, which circulate oppositely to the current that arises upon trapping of the magnetic flux. As a result, the stability of the magnetic structure is sharply improved since opposite driving forces can act on different sections of the vortices |
S 68 Smolyak, B. M. Elimination of magnetic relaxation in superconductors on approaching a ferromagnet / B. M. Smolyak, G. V. Ermakov // Physica C. - 2010. - Vol.470, №3. - С. 218-220 Рубрики: ФИЗИКА Кл.слова (ненормированные): MAGNETIC RELAXATION -- FERROMAGNET -- MAGNETIC STRUCTURE Аннотация: It is found that magnetic relaxation is suppressed in a high-temperature superconductor when it approaches a ferromagnet. It is supposed that this phenomenon results from formation of a nonequilibrium magnetic structure, in which counter driving forces act in different regions |
S 68 Smolyak, B. M. Effects of relaxation in levitating superconductors / B. M. Smolyak, G. N. Perelshtein, G. V. Ermakov (Yermakov) // Cryogenics. - 2002. - Vol.42, №10. - С. 635-644 Рубрики: ФИЗИКА Кл.слова (ненормированные): SUPERCONDUCTORS -- FLUX CREEP -- MAGNETIC LEVITATION Аннотация: The effect of the magnetic flux creep on the levitation stability of high-temperature superconductors was studied. It was shown experimentally that under a unipolar magnetization the levitation force decreased at a logarithmic velocity characteristic of the creep process. If the current structure was bi- or multi-polar one, which was formed in a sample exposed to a reversing external magnetic field, the force remained unchanged during a certain period of time. The theory of relaxation of magnetization and force for a partial and full penetration of the critical state was considered. It was shown that relaxation decelerated sharply if the region with a current producing the main magnetization was far from the superconductor surface. A concept of an open and internal magnetic relaxation was introduced. The time of the internal relaxation for different reverse depths was estimated. The calculated values approached the experimental values of the levitation stabilization time |
S 68 Smolyak, B. M. The effect of ac magnetic fields on the lifting power of levitating superconductors / B. M. Smolyak, G. V. Ermakov, L. I. Chubraeva // Superconductor Science and Technology. - 2007. - Vol.20, №4. - С. 406-411 Рубрики: ФИЗИКА Кл.слова (ненормированные): LEVITATION FORCE -- SUPERCONDUCTING SUSPENSION -- LIFTING FORCE Аннотация: This study deals with the decrease in the levitation force under the action of an ac field up to the frequency at which oscillations of the superconducting suspension are limited by inertia. The lifting force was measured as a function of the ac field amplitude and the exposure time. It was shown that the force quickly decreased at the moment the ac field was applied and then continued diminishing, but at a lower rate. A qualitative model was proposed, taking into account two effects of the ac field on the magnetization of the levitating superconductor: a complete destruction of the critical state in some section of the superconductor (to a depth λac) and the initiation of a faster magnetic relaxation in the region where the induction gradient is preserved |
S 86 Stopping of levitation force relaxation in superconductors: the flux-locking effect / B. M. Smolyak, G. N. Perelshtein, G. V. Ermakov, E. V. Postrekhin // Physica C. - 2000. - Vol.341-348, Pt.2. - С. 1129-1130 Рубрики: ФИЗИКА Кл.слова (ненормированные): SUPERCONDUCTORS -- FLUX-LOCKING EFFECT -- RELAXATION Аннотация: Stopping of levitation force relaxation in superconductors under conditions of flux creep was studied experimentally. This effect appears when the flux profile is modulated in the near-surface layer of a superconductor. It was assumed that levitation was stabilized thanks to locking of the magnetic flux and internal magnetic relaxation. During this relaxation, the flux was redistributed in a sample, but the full flux and the average magnetization of the sample remained unchanged. A parameter characterizing the modulation depth was introduced. This parameter allows calculating the time during which the levitation force is constant |
Z 19 Zakharov, M. S. Effect of External Nonuniform Magnetic Field on Flux Creep Process in Superconductor [Electronic resource] / M. S. Zakharov, B. M. Smolyak, G. V. Ermakov // Journal of Superconductivity and Novel Magnetism. - 2012. - Article in Press. - P1-4 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL STATE -- MAGNETIC RELAXATION -- SUPERCONDUCTORS Аннотация: The effect of an external nonuniform magnetic field on the flux creep rate in a high-temperature superconductor with trapped magnetic flux was studied. The magnetic relaxation was suppressed when the superconductor was put into a field of permanent magnets or when it approached a ferromagnet. The effect arises when the field sources (being magnetized, the ferromagnet produces its own field) are placed near the superconductor surface, where the flux line ends are located. For these cases, we carried out the calculations of vortex and current density distributions, which demonstrate that reverse currents flow in the near-surface regions of the sample. This verifies the hypothesis suggested earlier about the influence of counter Lorentz forces retarding the creep of the vortices. In the interpretation of the results, we also take into consideration the magnetic force acting on the vortex ends in the external nonuniform magnetic field that allows us to explain the experimental results, in which the current structure in the sample is unipolar |
S 68 Smolyak, B. M. ZFC-, FC- and Rem- susceptibility of granular superconductors [Text] / B. M. Smolyak, E. V. Postrekhin, G. V. Ermakov // Superconductor Science and Technology. - 1994. - V. 7. - P427-433 Рубрики: ФИЗИКА Кл.слова (ненормированные): ZFC-ЧУВСТВИТЕЛЬНОСТЬ -- FC-ЧУВСТВИТЕЛЬНОСТЬ -- Rem-ЧУВСТВИТЕЛЬНОСТЬ -- СВЕРХПРОВОДНИКИ ЗЕРНИСТЫЕ -- ЗЕРНИСТЫЕ СВЕРХПРОВОДНИКИ -- ТЕПЛОФИЗИКА |
R 35 Regular and chaotic thermal oscillations in current-carrying thin HTSC films [Text] / V. N. Skokov, V. P. Koverda, V. B. Ivakin, N. M. Semenova // Journal of Physics D. Applied Physics. - 1996. - V. 29, №3. - P843-847 Рубрики: ФИЗИКА Кл.слова (ненормированные): КОЛЕБАНИЯ РЕГУЛЯРНЫЕ -- РЕГУЛЯРНЫЕ КОЛЕБАНИЯ -- КОЛЕБАНИЯ ХАОТИЧЕСКИЕ -- ХАОТИЧЕСКИЕ КОЛЕБАНИЯ -- HTSC ПЛЕНКИ ПОТОКОНЕСУЩИЕ -- ПОТОКОНЕСУЩИЕ ПЛЕНКИ -- ПЛЕНКИ HTSC -- КОЛЕБАНИЯ ТЕРМИЧЕСКИЕ -- ТЕРМИЧЕСКИЕ КОЛЕБАНИЯ -- HTSC ПЛЕНКИ ТОНКИЕ -- ТОНКИЕ ПЛЕНКИ -- ПЛЕНКИ HTSC -- ТЕПЛОФИЗИКА Аннотация: We present the results of an experimental study of the dynamics of thermal self-oscillations of a normal zone in thin films of high-temperature superconductors (HTSC) connected to an external circuit with an inductance and cooled by boiling nitrogen. The response of the system to a harmonic driving force has been studied. Spectral and dynamical characteristics of various oscillative regimes have been determined. It is shown there arises a state of a deterministic chaos in some range of driving frequencies and amplitudes. An effective of synchronization of periodic self-oscillations of a normal zone and thermo-hydrodynamical oscillations caused by the boiling of liquid nitrogen near a film surface has been recognized |
S 66 Skokov, V. N. Waves and 1-f noise in two-phase liquid-vapor system under Joule self-heating of high-temperature superconductors in boiling nitrogen [Text] / V. N. Skokov, V. P. Koverda // Waves in two-phase tlows: Euroment Colloquium 376 (April 27-30 1998):Instanbul. Book of Abstracts. - 1998. - P87-88 Рубрики: ФИЗИКА Кл.слова (ненормированные): ВОЛНЫ -- СИСТЕМА ЖИДКОСТЬ-ПАР -- САМОРАЗОГРЕВ ДЖОУЛЯ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ -- ВЫСОКОТЕМПЕРАТУРНЫЕ СВЕРХПРОВОДНИКИ -- НИТРОГЕН КИПЯЩИЙ -- 1/f-ШУМ -- ТЕПЛОФИЗИКА -- КОЛЛОКВИУМЫ -- РЕФЕРАТЫ |
S 66 Skokov, V. N. An experimental study of 1/f-fluctuations at nonequilibrium first-order phase transitions under joule selfheating of high-temperature superconductors cooled by boiling nitrogen [Text] / V. N. Skokov, V. P. Koverda // Nucleation and Non-linear Prolems in the First-Order Phase Transitions (NPT'98): Final Programme and Book of Abstracts: First Int. Workshop (St. Peterburg, Pussia, 29 June - 3 July 1998). - 1998. - P45-46 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПЕРЕХОД НЕРАВНОВЕСНЫЙ -- неравновесные переходы -- ПЕРЕХОД ФАЗОВЫЙ I РОДА -- САМОРАЗОГРЕВ ДЖОУЛЯ -- ДЖОУЛЯ САМОРАЗОГРЕВ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ -- ВЫСОКОТЕМПЕРАТУРНЫЕ СВЕРХПРОВОДНИКИ -- АЗОТ КИПЯЩИЙ -- КИПЯЩИЙ АЗОТ -- АЗОТ -- N |
T 44 The effect of an Alternating Magnetic-Field on the Stability of Hard Levitation of High-Temperature Superconductors [Text] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov, E. V. Postrekhin, L. M. Shou, I. B. Smolyak, S. V. Naumov // Materials Science and Engineering B. Solid State Materials for Advanced Technology. - 1998. - V. 53, Iss. 1-2. - P177-181 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПОЛЕ МАГНИТНОЕ -- ПОЛЕ ПЕРЕМЕННОЕ -- ЛЕВИТАЦИЯ ТЯЖЕЛАЯ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ |