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Author (up) Ferrari, H.; Valenzuela, S.O.; Bekeris, V.; Guimpel, J.; de la Cruz, F.
Title Short-time magnetization in superconducting thin films Type Journal Article
Year 1998 Publication REVISTA MEXICANA DE FISICA Abbreviated Journal
Volume 44 Issue Pages 193-195
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Abstract We have investigated the magnetization in thin (Y;Gd)Ba2Cu3O7-delta superconducting films in the 100 μs time scale. Magnetic moment was measured with a non-conventional technique that combines the use of a pulsed magnetic field and a synchronized pulsed laser. Both virgin and magnetically cycled samples were examined and results are described within Bean's critical state model.
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ISSN 0035-001X ISBN Medium
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Notes ISI:000077675900051 Approved no
Call Number BT @ hernan @ Serial 182
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Author (up) Valenzuela, S.O.; Ferrari, H.; Bekeris, V.; Marconi, M.C.; Guimpel, J.; de la Cruz, F.
Title Nonconventional short-time dc magnetometer for superconducting films Type Journal Article
Year 1998 Publication REVIEW OF SCIENTIFIC INSTRUMENTS Abbreviated Journal
Volume 69 Issue 1 Pages 251-254
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Abstract A nonconventional technique for the measurement of magnetic relaxation in superconducting films at short times (similar to 10(-5) s) is described. This technique combines the application of a pulsed magnetic field and a synchronized high-energy pulsed laser. Remanent magnetic relaxation in (Y;Gd)Ba2Cu3O7-delta thin films is reported over five decades time at reduced temperatures above 0.8. (C) 1998 American Institute of Physics.
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ISSN 0034-6748 ISBN Medium
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Notes ISI:000071578800041 Approved no
Call Number BT @ hernan @ Serial 185
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Author (up) Valenzuela, S.O.; Maiorov, B.; Osquiguil, E.; Bekeris, V.
Title Elastic-to-plastic crossover below the peak effect in the vortex solid of YBa2Cu3O7 single crystals Type Journal Article
Year 2002 Publication Physical Review B – Condensed Matter and Materials Physics Abbreviated Journal Phys. Rev. B Condens. Matter Mater. Phys.
Volume 65 Issue 6 Pages 605041-605044
Keywords barium; copper; yttrium; analytic method; article; crystal structure; elasticity; molecular interaction; stress; structure analysis; temperature; vortex motion
Abstract We report on transport and ac susceptibility studies below the peak effect in twinned YBa2Cu3O7 single crystals. We find that disorder generated at the peak effect can be partially inhibited by forcing vortices to move with an ac driving current. The vortex system can be additionally ordered below a well-defined temperature where elastic interactions between vortices overcome pinning-generated stress and a plastic-to-elastic crossover seems to occur. The combined effect of these two processes results in vortex structures with different mobilities that give place to history effects.
Address Physics Department, Harvard University, Cambridge, MA 02138, United States
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ISSN 01631829 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 11; Export Date: 17 April 2009; Source: Scopus; Art. No.: 060504; CODEN: PRBMD; Language of Original Document: English; Correspondence Address: Valenzuela, S.O.; Physics Department; Harvard University Cambridge, MA 02138, United States; References: De Sorbo, W., (1964) Rev. Mod. Phys., 36, p. 90; Pippard, A.B., (1969) Philos. Mag., 19, p. 217; Larkin, A.I., Ovchinnikov, Y.N., (1979) J. Low Temp. Phys., 34, p. 409; W Approved no
Call Number BT @ osquigui @ Serial 370
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