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Author Rodríguez, E.; Duran, C.; Luzuriaga, J.; de la Cruz, F.; Fainstein, C.
Title Anomalous behaviour of the vortex structure in Bi4Ca2Sr4Cu4O16+y measured with a vibrating reed at low magnetic fields Type Journal Article
Year 1990 Publication Physica C: Superconductivity Abbreviated Journal Physica C
Volume 165 Issue (up) 3-4 Pages 315-320
Keywords
Abstract The response of the vortex structure in ceramic samples of Bi4Ca2Sr4Cu4O16+y has been measured by means of a vibrating reed technique in magnetic fields below 0.2 T. An anomally in the response of the reed is seen at temperatures of around 30 to 40 K, well below the critical temperature, indicating a transition similar to that attributed to a melting of the Flux Line Lattice. There is a shift in the temperature at which the anomaly is detected when one increases the driving force on the reed, while the dissipation shows a maximum associated to the transition which scales with the square of the applied magnetic field. Comparison with magnetization measurements shows that there is non-zero critical current at the same temperature where the anomalous behaviour is detected with our technique.
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ISSN 0921-4534 ISBN Medium
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Notes ISI:A1990CN49800014 Approved no
Call Number BT @ hernan @ Serial 261
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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.
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 (up) 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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Call Number BT @ gnieva @ Serial 454
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Author Decca, R.; Osquiguil, E.; de la Cruz, F.; D'Ovidio, C.; Malachevski, M.T.; Esparza, D.
Title Non linear temperature dependence of the resistivity of LaSrCuO: Effects of Sr content Type Journal Article
Year 1989 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 69 Issue (up) 4 Pages 355-357
Keywords Ceramic Materials; Lanthanum Compounds--Electric Conductivity; Superconductivity; Ceramic Superconductors; Superconducting Materials
Abstract The linear temperature dependence of the electrical resistivity has been taken to be one of the characteristic features of the ceramic superconductors. Measurements of the electrical resistance of the LaSrCuO system in a wide temperature range show that the previous statement is only an approximation valid for some values of the Sr concentration.
Address Applied Research Department, Centro At'omico Bariloche
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ISSN 00381098 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Decca, R.; Basic Research Department; Centro At Approved no
Call Number BT @ osquigui @ Serial 414
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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 (up) 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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ISSN 01631829 (ISSN) ISBN Medium
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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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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.
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 (up) 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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Call Number BT @ gnieva @ Serial 450
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Author López, D.; Nieva, G.; de la Cruz, F.
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 (up) 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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Call Number BT @ gnieva @ Serial 451
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Author Civale, L.; de la Cruz, F.; Luzuriaga, J.
Title Critical temperature and density of states in amorphous Zr70Cu30 Type Journal Article
Year 1983 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 48 Issue (up) 4 Pages 389-391
Keywords ZIRCONIUM COPPER ALLOYS
Abstract By means of thermal heat treatment of amorphous Zr70Cu30 it is shown that the induced decrease in critical temperature is followed by a reduction in the electronic density of states of the same magnitude as that obtained by changing the Cu concentration. This result indicates that the density of states is the fundamental microscopic parameter determining the superconducting behavior.
Address Centro Atomico Bariloche
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Publisher Place of Publication Editor
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 00381098 (ISSN) ISBN Medium
Area Expedition Conference
Notes Cited By (since 1996): 1; Export Date: 28 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Civale, L.; Centro At Approved no
Call Number BT @ luzuriag @ Serial 503
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Author Guimpel, J.; Civale, L.; de la Cruz, F.; Murduck, J.M.; Schuller, I.K.
Title Dimensional phase transition in superconductors with short coherence length Type Journal Article
Year 1988 Publication Physical Review B Abbreviated Journal PRB
Volume 38 Issue (up) 4 Pages 2342-2344
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Abstract We found a novel dimensional transition in the vortex lattice of a finite-sized superconductor. The low-field dependence (with field applied parallel to the film plane) of the magnetization exhibits two maxima, which signal the transition from one to two dimensions. In one dimension the vortices line up along the film, and with increasing field their arrangement changes into a two-dimensional array due to the competition between vortex-surface and vortex-vortex repulsion. Agreement is found with no adjustable parameter calculations using a priori known surface-barrier and vortex-repulsion effects.
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Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ 10.1103/PhysRevB.38.2342 Serial 539
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Author Correa, V.F.; Nieva, G.; de la Cruz, F.
Title Vortex softening: Origin of the second peak effect in Bi2Sr2CaCu2O8+delta Type Journal Article
Year 2001 Publication PHYSICAL REVIEW LETTERS Abbreviated Journal
Volume 87 Issue (up) 5 Pages 057003
Keywords
Abstract Magnetic hysteresis and transverse ac permeability measurements in Bi2Sr2CaCu2O8+delta allow a comparative analysis of the critical current with the elastic response of vortex structures, in equilibrium with their pinning potential, in the field and temperature region where the second peak is detected. This study provides strong evidence that the second peak has its origin in changes of the elastic equilibrium properties of the vortex structures.
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ISSN 0031-9007 ISBN Medium
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Notes ISI:000170212200049 Approved no
Call Number BT @ hernan @ Serial 215
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Author de la Cruz, F.; Fink, H.J.; Luzuriaga, J.
Title Temperature dependence of the superconducting giant-vortex state. Theory and Experiment Type Journal Article
Year 1979 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 20 Issue (up) 5 Pages 1947-1959
Keywords
Abstract When a type-I superconductor with a surface nucleation field Hc3(T)>Hc(T) (thermodynamic critical field) is thermally cycled in an axially applied magnetic field H0 between the temperatures T(Hc3) and about T(Hc), experiments show that the magnetization changes reversibly. The latter is diamagnetic near T(Hc3) but can be paramagnetic just above T(Hc). This behavior is explained by assuming that the fluxoid quantum number b is fixed at the transition from the normal to the superconducting state and retained at lower temperatures. The value of b is determined almost entirely by the flux at the transition which is enclosed by a contour located at a distance ξ1.7 from the surface inside the cylinder (ξ is the coherence length). The temperature variation of the order parameter f at the surface of the cylinder, the magnetization m, and the temperature at which m=0 for f≠0 are calculated for R>>ξ. Conservation of the fluxoid quantum number, while T is varied causes the two opposing surface currents to become imbalanced. This is the source of the observed para- and diamagnetism.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0163-1829 ISBN Medium
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Notes ISI:A1979HP51300019 Approved no
Call Number BT @ hernan @ Serial 275
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