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Author 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
Keywords
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 (up) Medium
Area Expedition Conference
Notes ISI:000077675900051 Approved no
Call Number BT @ hernan @ Serial 182
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Author 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
Keywords
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 (up) Medium
Area Expedition Conference
Notes ISI:000071578800041 Approved no
Call Number BT @ hernan @ Serial 185
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Author Grigera, S.A.; Grigera, T.S.; Righi, E.F.; Nieva, G.; de la Cruz, F.
Title Flux-cutting in YBa2Cu3O7-delta revisited Type Journal Article
Year 2002 Publication PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS Abbreviated Journal
Volume 371 Issue 3 Pages 237-242
Keywords
Abstract In this paper we present an analysis of the response of the vortices in YBa2Cu3O7-delta to different configurations of applied driving forces. The use of inhomogeneous current allows us to induce vortex cutting. We determine the maximum current injected in different electrical contact distributions which preserves vortex integrity, and we show that vortex cutting cannot be explained by a single vortex picture. (C) 2001 Elsevier Science B.V. All rights reserved.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0921-4534 ISBN (up) Medium
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Notes ISI:000176131500007 Approved no
Call Number BT @ hernan @ Serial 212
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Author Fasano, Y.; Menghini, M.; de la Cruz, F.; Nieva, G.
Title Weak interaction and matching conditions for replicas of vortex lattices Type Journal Article
Year 2000 Publication PHYSICAL REVIEW B Abbreviated Journal
Volume 62 Issue 22 Pages 15183-15189
Keywords
Abstract We present experiments demonstrating the conditions under which weak interaction between replicas of vortex structures break their translational and rotational symmetry. The Fe clumps introduced by Bitter decorations of vortex structures are used to induce an extremely weak interaction fur subsequent vortex structures in low and high temperature superconducting crystals. The matching between the Fe pattern acid the vortex configuration require the structure to be prepared under quite stringent conditions: The field creating the structure has to be the same in magnitude although it can differ in orientation from that used for the preparation of the Fe pattern. The interaction between vortex replicas as represented by the Fe clumps of Bitter decorations makes it possible to differentiate the vortex nucleation and propagation mechanisms in low and high temperature superconductors.
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Series Volume Series Issue Edition
ISSN 0163-1829 ISBN (up) Medium
Area Expedition Conference
Notes ISI:000165883800075 Approved no
Call Number BT @ hernan @ Serial 219
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Author Correa, V.F.; Herbsommer, J.A.; Kaul, E.E.; de la Cruz, F.; Nieva, G.
Title Onset of the 0-dimensional vortex pinning behavior in the optimally doped and overdoped Bi2Sr2CaCu2O8+delta system Type Journal Article
Year 2000 Publication PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS Abbreviated Journal
Volume 341 Issue Pages 1285-1286
Keywords
Abstract We report results of transverse AC magnetic permeability in the linear regime and DC magnetization loops for optimally doped and oxygen overdoped samples of Bi2Sr2CaCu2O8+delta The data cover the low temperature (T < 25K) and low held (H-a < 1000 Oe) region of the magnetic (H-a-T) phase diagram. In optimally doped as well as in overdoped samples a crossover to a O-dimensional pinning regime (Larkin length, L-C(C), shorter than the inter-plane CuO2 distance) is observed at a characteristic temperature Too for all investigated fields. The order-disorder transition, identified by the second peak in magnetization and a non monotonous field dependence of the AC penetration depth, is quenched below T-0D.
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Series Editor Series Title Abbreviated Series Title
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ISSN 0921-4534 ISBN (up) Medium
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Notes ISI:000165855700242 Approved no
Call Number BT @ hernan @ Serial 221
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Author Grigera, S.A.; Morre, E.; Osquiguil, E.; Nieva, G.; de la Cruz, F.
Title Two-step liquid-solid vortex transition with the field along the ab planes in YBa2Cu3O7-delta crystals Type Journal Article
Year 1999 Publication PHYSICAL REVIEW B Abbreviated Journal
Volume 59 Issue 17 Pages 11201-11204
Keywords
Abstract Resistivity measurements for different Lorentz force configurations and the detection of the longitudinal vortex velocity correlation length, with the magnetic field applied parallel to the ab planes, in the mixed state of clean and twinned YBa2Cu3O7-delta single crystals,' support the existence of a vortex-smectic phase when the vortices interact with an attractive periodic potential. The transition from the vortex-liquid to the vortex-solid state is shown to be achieved in two steps, a continuous transition from a liquid to a possible smectic phase and another continuous one from the smectic phase to a solid. [S0163-1829(99)09413-8].
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0163-1829 ISBN (up) Medium
Area Expedition Conference
Notes ISI:000084631900027 Approved no
Call Number BT @ hernan @ Serial 231
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Author Grigera, S.A.; Morre, E.; Osquiguil, E.; Balseiro, C.; Nieva, G.; de la Cruz, F.
Title Bose-glass phase in twinned YBa2Cu3O7-delta Type Journal Article
Year 1998 Publication PHYSICAL REVIEW LETTERS Abbreviated Journal
Volume 81 Issue 11 Pages 2348-2351
Keywords
Abstract Using an extensive scaling analysis of the transport properties in twinned YBa2Cu3O7-delta crystals we have experimentally found the predicted change in the universality class of the Bose-glass to liquid transition when the magnetic field is applied at small angles away from the direction of the correlated defects. The new dynamical critical exponent is s' = 1.1 +/- 0.3.
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0031-9007 ISBN (up) Medium
Area Expedition Conference
Notes ISI:000075897300042 Approved no
Call Number BT @ hernan @ Serial 235
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Author Maiorov, B.; Silhanek, A.V.; De la Cruz, F.; Osquiguil, E.
Title Comment on “strong vortex liquid correlation from multiterminal measurements on untwinned YBa2Cu3O7-? single crystals” Type Journal Article
Year 2002 Publication Physical Review Letters Abbreviated Journal Phys Rev Lett
Volume 88 Issue 13 Pages 1397031
Keywords
Abstract Multiterminal measurements using experimental technique on twinned and untwinned YBa2Cu3O7-? crystals were presented. Inhomogeneous current distribution acting upon an uncorrelated vortex system showed that the dissipation of voltage at the top was larger than at the bottom. The behavior of the current voltage curves showed that the result Vtop = Vbot was a consequence of the limited voltage sensitivity.
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ISSN 00319007 (ISSN) ISBN (up) Medium
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Notes Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; Language of Original Document: English; Correspondence Address: Maiorov, B.; Centro At Approved no
Call Number BT @ osquigui @ Serial 368
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Author Maiorov, B.; Silhanek, A.V.; De la Cruz, F.; Osquiguil, E.; Rydh, A.; Rapp,
Title Comment on “strong vortex liquid correlation from multiterminal measurements on untwinned YBa2Cu3O7-? single crystals” [2] (multiple letters) Type Journal Article
Year 2002 Publication Physical Review Letters Abbreviated Journal Phys Rev Lett
Volume 88 Issue 13 Pages
Keywords Current voltage characteristics; Electric potential; Extrapolation; Magnetic fields; Melting; Twinning; Vortex flow; Yttrium barium copper oxides; Multiterminal measurements; Single crystals
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ISSN 00319007 (ISSN) ISBN (up) Medium
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Notes Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; Language of Original Document: English; Correspondence Address: Maiorov, B.; Centro At Approved no
Call Number BT @ osquigui @ Serial 369
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Author Osquiguil, E.J.; Civale, L.; Decca, R.; De La Cruz, F.
Title Metallic to variable-range-hopping transition controlled by oxygen content in La-Sr-Cu-O Type Journal Article
Year 1988 Publication Physical Review B Abbreviated Journal
Volume 38 Issue 4 Pages 2840-2842
Keywords
Abstract We have performed electrical resistivity measurements on the superconductor La1.8Sr0.2CuO4- over a wide range of temperatures and oxygen concentration. The results provide experimental evidence for a transition from a metallic behavior at high temperatures to a variable-range hopping regime at low temperatures. The transition is controlled by the oxygen content. Correlation between both regimes is also shown.
Address Centro Atmico Bariloche, Instituto Balseiro, 8400 Bariloche, R
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 01631829 (ISSN) ISBN (up) Medium
Area Expedition Conference
Notes Cited By (since 1996): 6; Export Date: 17 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.38.2840; Language of Original Document: English; Correspondence Address: Osquiguil, E.J.; Centro Atmico Bariloche; Instituto Balseiro 8400 Bariloche, R Approved no
Call Number BT @ osquigui @ Serial 415
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