The investigation of magnetic flux dynamics in the bulk HTS with the levitation techniques

Kordyuk, A. A.; Nemoshkalenko, V. V.; Viznichenko, R; Gawalek, W.

doi:10.1016/s0921-5107(97)00322-x

Cited by 8 publications

(20 citation statements)

References 10 publications

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“…Measuring the parameters of forced oscillations of a PM one can obtain information about structure and electromagnetic properties of explored HTS samples. Figure 3 represents a basic system [24][25][26], which has been used with granular [27][28][29][30][31][32] and composite [30,32] YBCO and BSCCO ceramics, and, in a slight modification, with the meltprocessed YBCO quasi-single crystals [11,[32][33][34][35][36]. Here, the forced oscillations of the permanent magnet with mass m, magnetic moment , and diameter d, which levitates on the distance of x 0 over the surface of the HTS sample, have been induced by the AC coil, and their amplitude has been measured by the microscope with 5 m accuracy.…”

Section: Resonance Oscillation Techniquementioning

confidence: 99%

“…In [33][34][35] we have shown that the approach of ideally hard superconductor is very useful to describe the elastic properties of levitation systems with the melttextured HTS and as a first approximation to calculate the AC losses. The idea of the approach is to use the surface shielding currents which screens the sample from the penetration of the magnetic field variation (in respect to its initial, frozen distribution over the surface) to calculate the magnetic field distribution outside the superconductor and to obtain from this the elastic properties of the PM-HTS system.…”

Section: Zero Approximation: Ideally Hard Superconductormentioning

confidence: 99%

“…For the melt-processed HTS where the energy losses have predominantly hysteretic nature [34,35] the feasibility of such an approximation can be determined from the critical state model (the thickness of the layer  carrying the critical current J c must be well less than the PM-HTS distance:   z 0 ; see Eq. (11)).…”

Section: First Approximation: Energy Lossesmentioning

confidence: 99%

“…13. Experimental data of inverse Q-factor vs. PM amplitude for upper sides of different melt-processed HTS samples [35].…”

Section: First Approximation: Energy Lossesmentioning

confidence: 99%

“…Even for J c  10 4 A/cm 2 and for b  100 G the penetration depth   0.1 mm. Figure 13 presents the experimental data obtained with the slightly modified resonance oscillation technique [35]. The linear dependences for the inverse Qfactor (Q 1    A) mean that energy losses have two components:…”

Section: First Approximation: Energy Lossesmentioning

confidence: 99%

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Magnetic Flux Dynamics in HTS Bulks with Levitation Techniques

et al. 2002

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The discovery of high-temperature superconductors (HTS) has led to understanding that, in order to explain and utilize the phenomenon, completely new physical approaches should be introduced at all scales: microscopic, mesoscopic, macroscopic. Leaving first two scales beyond the scope of the present paper, we focus in the upper limit of the last scale, the study of the magnetic flux dynamics in HTS bulks-the dynamics of the 'compact vortex structures'. A new direction in the experimental superconducting physics, the investigation of HTS bulks with levitation techniques, which has been elaborated during last years to effectively explore the subject, as well as the new fundamental and applied results obtained there from are overviewed here.Відкриття високотемпературних надпровідників (ВТНП) призвело до розуміння то-го, що задля пояснення та використання цього явища на всіх рівнях: мікроскопічно-му, мезоскопічному та макроскопічному, має бути створено принципово нові фізичні підходи. Полишаючи перші два рівні поза увагою даної роботи, ми детально розгля-даємо верхню границю останнього -дослідження динаміки магнітного потоку в масивних ВТНП, динаміки «компактових вихорових структур». Дана робота -це огляд нового напрямку експериментальної фізики надпровідників -дослідження масивних ВТНП левітаційними методами -що його було вироблено останнім часом для вивчення зазначеної проблеми, а також тих нових фундаментальних та практич-них результатів, що було тут отримано.Открытие высокотемпературных сверхпроводников (ВТСП) привело к пониманию того, что для объяснения и использования этого явления необходимо создание принципиально новых физических подходов на всех уровнях: микроскопическом, мезоскопическом, макроскопическом. Оставляя первые два уровня за рамками данной работы, мы сфокусировали внимание на верхнем пределе последнего -исследовании динамики магнитного потока в массивных ВТСП, динамики «ком-пактных вихревых структур». Данная работа -это обзор нового направления экс-периментальной физики сверхпроводников, которое было выработано за послед- Fiz. Met. 2002, т. 3, сс. 357-386 Оттиски доступны непосредственно от издателя Фотокопирование разрешено только в соответствии с лицензией 2002 ИМФ (Институт металлофизики им. Г. В. Курдюмова НАН Украины) Напечатано в Украине. 358A. A. Kordyuk, V. V. Nemoshkalenko , A. I. Plyushchay, and R. V. Viznichenko ние годы, а также тех новых фундаментальных и прикладных результатов, которые были здесь получены.

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Section: Resonance Oscillation Techniquementioning

confidence: 99%

Section: Zero Approximation: Ideally Hard Superconductormentioning

confidence: 99%

Section: First Approximation: Energy Lossesmentioning

confidence: 99%

“…13. Experimental data of inverse Q-factor vs. PM amplitude for upper sides of different melt-processed HTS samples [35].…”

Section: First Approximation: Energy Lossesmentioning

confidence: 99%

Section: First Approximation: Energy Lossesmentioning

confidence: 99%

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Magnetic Flux Dynamics in HTS Bulks with Levitation Techniques

et al. 2002

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Vortex Dynamics in Bulk HTS with Levitation Techniques

Kordyuk¹,

Nemoshkalenko²,

Plyushchay³

et al. 1999

Physics and Materials Science of Vortex States, Flux Pinning and Dynamics

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Surface influence on flux penetration into HTS bulks

Kordyuk

Krabbes

Nemoshkalenko

et al. 2000

Physica B: Condensed Matter

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The influence of surface treatment on AC loss in melt-processed quasi-single crystal HTS was investigated with resonance oscillations technique. We have found that amplitude dependencies of AC loss on magnetic field amplitude become rather complicated after surface polishing. The experimental data show well distinguished dynamic crossover from absence of barrier at low rates of field variation to its appearence at higher rates. An explaination of such a dynamic surface barrier appearance based on consideration of along surface vortex propagation was suggested.

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The investigation of magnetic flux dynamics in the bulk HTS with the levitation techniques

Cited by 8 publications

References 10 publications

Magnetic Flux Dynamics in HTS Bulks with Levitation Techniques

Magnetic Flux Dynamics in HTS Bulks with Levitation Techniques

Vortex Dynamics in Bulk HTS with Levitation Techniques

Surface influence on flux penetration into HTS bulks

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