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Author López, D.; Righi, E. F.; Nieva, G.; de la Cruz, F. openurl 
  Title Coincidence of Vortex-Lattice Melting and Loss of Vortex Correlation along the c Direction in Untwinned YBa2Cu3O7-δ Single Crystals Type Journal Article
  Year 1996 Publication Physical Review Letters Abbreviated Journal Phys. Rev. Lett.  
  Volume 76 Issue Pages 4034  
  Keywords  
  Abstract We report on transport measurements using the dc flux transformer configuration in clean and twinned single crystals of YBa2Cu3O7-δ. We show that correlated disorder changes not only the order of the solid-liquid phase transition but also the nature of the vortices in the liquid state. In clean crystals, melting is shown to take place between a solid of vortex lines and a liquid with no correlation in the direction of the magnetic field.  
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  Notes Approved no  
  Call Number BT @ gnieva @ Serial 448  
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Author Safar, H.; Lopez, D.; Gammel, P.L.; Huse, D.A.; Majumdar, S.N.; Schneemeyer, L.F.; Bishop, D.J.; Nieva, G.; de la Cruz, F. openurl 
  Title Experimental evidence of a non-local resistivity in a vortex line liquid Type Journal Article
  Year 1994 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 235-240 Issue 4 Pages 2581-2582  
  Keywords  
  Abstract We present transport measurements on YBCO single crystals in the vortex liquid regime using the DC flux transformer geometry. We show that the data are inconsistent with the material being an anisotropic, local conductor. The results provided evidence for non-local transport which indicate that there can be correlated vortex motion over macroscopic distances in this system. We have shown that this correlated vortex motion can be destroyed by either thermal fluctuations or the applications of large driving forces.  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 450  
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Author López, D.; Nieva, G.; de la Cruz, F. openurl 
  Title Long range correlations of the vortex structure in YBCO single crystals Type Journal Article
  Year 1994 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 235-240 Issue 4 Pages 2575-2576  
  Keywords  
  Abstract Transport measurements in the mixed state of YBa2Cu3O7 single crystals using the “DC flux transformer” configuration show that the glass-liquid phase transition at the irreversibility line, TI(H), behaves as a three dimensional vortex phase transition. These results together with resistance measurements in the c direction show that the vortex correlation across the sample is destroyed at a temperature Tth(H), higher than TI(H). The sample thickness dependence of Tth(H) suggest that in the real thermodynamic phase transition (infinite sample), the long range correlation in the ab plane as well in the c direction is lost at the single temperature TI(H).  
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  Notes Approved no  
  Call Number BT @ gnieva @ Serial 451  
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Author de la Cruz, F.; Pastoriza, H.; López, D.; Goffman, M. F.; Arribére, A.; Nieva, G. openurl 
  Title Consequences of 3D-2D vortex decoupling on the phase diagram of HTS Type Journal Article
  Year 1994 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 235-240 Issue 1 Pages 83-86  
  Keywords  
  Abstract We discuss the quench of the long range order in the direction parallel and perpendicular to the field, in the mixed state of BSCCO(2212) and YBCO(123) single crystals. The experimental data show that the high temperature vortex phase in both systems is an uncorrelated liquid phase in all directions.  
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  Notes Approved no  
  Call Number BT @ gnieva @ Serial 453  
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Author López, D.; Jagla, E. A.; Righi, E. F.; Osquiguil, E.; Nieva, G.; Morré, E.; de la Cruz, F.; Balseiro, C. A. openurl 
  Title Dynamic softening of vortex lines in YBa2Cu3O7−δ single crystals Type Journal Article
  Year 1996 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 260 Issue 3-4 Pages 211-216  
  Keywords  
  Abstract Transport measurements in the mixed state of oxygen-deficient YBa2Cu3O7−δ single crystals using the flux transformer configuration show that the flux liquid changes with increasing anisotropy from strongly correlated to uncorrelated in the field direction. For intermediate coupling, the current inducing loss of vortex correlation has a maximum near the irreversibility temperature. Thus, an effective softening of vortex lines with decreasing temperature is detected. We propose a simple model that accounts for this behavior by including the effects of the pinning potential on the dynamics of vortices.  
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  Notes Approved no  
  Call Number BT @ gnieva @ Serial 454  
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Author de la Cruz, F.; López, D.; Nieva, G. openurl 
  Title Thermally induced change in the vortex dimensionality of YBa2Cu3O7 single crystals Type Journal Article
  Year 1994 Publication Philosophical Magazine Part B Abbreviated Journal Philos. Mag. B  
  Volume 70 Issue 3 Pages 773 - 786  
  Keywords  
  Abstract Transport measurements in YBa2Cu3O7 single crystals using a modification of the d.c. flux transformer configuration are reported. We show that, for applied magnetic fields in the crystallographic c direction, the vortex correlation length in this direction is reduced to values smaller than the thickness of the sample. The reduction can be induced either by thermal disorder (linear response) or by flux cutting after the vortices reach a critical velocity (nonlinear response). The results show that, in the transition from a vortex-glass state to a vortex-liquid state, the vortices are effectively three dimensional in character. A two-dimensional regime is induced at higher temperatures well inside the reversibility region.  
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  Notes Approved no  
  Call Number BT @ gnieva @ Serial 456  
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Author de la Cruz, F.; López, D.; Righi, E. F.; Nieva, G. isbn  openurl
  Title Comparative Study of Vortex Correlation in Twinned and Untwinned YBa2Cu3O7 Single Crystals Type Conference Article
  Year 1996 Publication Proceedings of the 10th Anniversary Hts Workshop on Physics, Materials and Applications Abbreviated Journal  
  Volume Issue Pages 395  
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  Abstract  
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  Publisher World Scientific Publishing Company Place of Publication Singapore Editor Batlogg, B.  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN 9810227159 Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 461  
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Author López, D.; Righi, E. F.; Nieva, G.; de la Cruz, F.; Kwok, W. K.; Fendrich, J. A.; Crabtree, G. W.; Paulius, L. isbn  openurl
  Title Discontinuous Onset of the c-axis Vortex Correlation at the Melting Transition in YBa2Cu3O7 Type Conference Article
  Year 1996 Publication Proceedings of the 10th Anniversary Hts Workshop on Physics, Materials and Applications Abbreviated Journal  
  Volume Issue Pages 411  
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  Corporate Author Thesis  
  Publisher World Scientific Publishing Company Place of Publication Singapore Editor Batlogg, B.  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN 9810227159 Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 462  
Permanent link to this record
 
 
Author Righi, E. F.; Grigera, S. A.; Nieva, G.; de la Cruz, F. openurl 
  Title Vortex phase coherence along the c axis in YBa2Cu3O7-d Type Journal Article
  Year 1998 Publication Superconduvtivity Reviews Abbreviated Journal  
  Volume 2 Issue Pages 205  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1054-2698 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 465  
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Author de la Cruz, F.; de la Cruz, M.E.; Cotignola, J.M. openurl 
  Title Efecto magnetomorfico longitudinal en laminas de In Type Report
  Year 1968 Publication Informe Tecnico CNEA Abbreviated Journal  
  Volume Issue 217 Pages 1-16  
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  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Buenos Aires Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0325-1403 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 545  
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