THE Y-HTSC RESISTIVE STATE DYNAMICS IN THE NON STATIONARY MAGNETIC FIELD

The paper carries out the research on the bulk ceramic high-temperature superconductors in resistive state and analyses two physical situations: dissipative motion of magnetic flux vortices throughout the whole sample, and localised in a thin near-surface layer. Hysteresis character of granular superconductor resistance in resistive state in case of change of external magnetic field has been detected. It is shown that a small alternating magnetic field ambiguously influences the resistance of HTSC in resistive state dependıng on the frequency due to the redistribution of magnetic flux vortices from weak pinning centres (from intergranular medium) to stronger centres (to granules).

research, sample, resistive state, vortex, magnetic field, penetration, dissipation, contact, resistance

1. Kovalev L.K., Kovalev K.L., Koneev S. M. i dr. Èlektričeskie ustrojstva na osnove massivnyh vysoko-temperaturnyh sverhprovodnikov. Moscow: FIZMAT-LIT Publ., 2010. 396 p. (in Russ.)

2. Altov V.A., Glebov I.A., Срernoplekov I.A. Sverhprovodnikovye tehnologii — novyj ètap v razvitii èlektrotehniki i èlektroènergetiki. Sverhprovodimostʹ: issledovaniâ i razrabotki, 2002, no. 11, p. 5 (in Russ.).

3. Zhukov A.A., Komarkov D.A., Motchalkov V.V. et al. Vliânie sobstvennogo i zahvačennogo magnitnogo polâ na kritičeskij tok keramiki Y1Ba2Cu3O7 –x. Sverhprovodimostʹ: fiz., himiâ, tehn, 1990, vol. 3, no. 6, pp. 1234-1243 (in Russ.).

4. Bashkirov Yu.A., Fleishman L.S. Massivnye vysokotemperaturnye sverhprovodâŝie materialy dlâ silʹnotočnyh primenenij. Sverhprovodimostʹ: fiz., himiâ, tehn., 1992, vol. 5, no. 8, pp. 1351-3182.

5. Pan V.M. Kritičeskie toki v vysokotempera-turnyh sverhprovodnikah. Ž. Vser. him. o – va, 1989, vol. 34, no. 4. pp. 509-519 (in Russ.).

6. Mannhart J., Tsuei C.C. Limits of the critical current density of polycrystalline higt –temperature su-perconductors based on the current transport properties of single grain boundaries. Z. Phys. B, 1989, vol. 77, no. 1. pp. 53-59 (in Eng.).

7. Chen D.X., Munoz J.M., Puig T., et al. Multi –level granular structure in high –Tc superconductors. Proc. ICTPS`90. Int. Cof. Transp. Prop. Supercond., Rio de Janeiro. Apr, 1990. Singapore,1990, pp. 198-220 (in Eng.).

8. Obara H., Yamasaki H., Kimure Y., et al. Irre-versible behavior of the transport critical current in poly-crystalline Y –Ba –Cu –O. Appl. Phys.Lett., 1989, vol. 55, no. 22, pp. 2342-2344 (in Eng.).

9. Qian Y.J., Tang Z.M., Chen K.Y., et al. Transport hysteresis of the oxide superconductors Y –Ba –Cu –O in applied fields. Phys. Rev. B, 1989, vol. 39, no. 7. pp. 4701-4703 (in Eng.).

10. Miloshenko V.E., Golev I.M., Brudanina L.L. Soprotivlenie kontaktov metall–granulirovannyj sverhprovodnik v magnitnom pole. Dejstvie èlektromag-nitnyh polej na plastičnostʹ i pročnostʹ materialov: Tez. dokl. Voronezh: VGTU Publ., 1996, p. 49 (in Russ.).

11. Golev I.M., Miloshenko V.E., Brudanina L.L. Magnitosoprotivlenie kontaktov metall–granulirovannyj sverhprovodnik. Izv. AN. Fiz. Seriâ, 1997, vol. 61, no. 5. pp.1005-1008 (in Russ.).

12. Alifercev O.N., Livanov A.E. Matematičeskaâ modelʹ izmereniâ udelʹnogo soprotivleniâ struktur VTSP–metall metodom nezavisimogo kontakta. Sverhprovodimostʹ: fiz., himiâ i tehn., 1994, vol. 7, no. 10-12, pp. 1588-1560 (in Russ.).

13.