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Author Ridner, A.; Martínez, E. N.; de la Cruz, F.
Title Surface-Temperature Determination in the Kapitza Problem Type Journal Article
Year 1975 Publication Physical Review Letters Abbreviated Journal Phys. Rev. Lett.
Volume 35 Issue 13 Pages 855-858
Keywords
Abstract It is shown that surface superconductivity can be used as a localized thermometer. Its application to the study of the thermal boundary resistance at a Pb-4He interface provides the first experimental evidence for the existence of a rapid temperature variation within microscopic distances from the surface.
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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/PhysRevLett.35.855 Serial 553
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Author Arce, R.; de la Cruz, F.; Esquinazi, P.
Title Superconducting penetration depth in amorphous La70Cu30 Type Journal Article
Year 1981 Publication Physica B+C Abbreviated Journal
Volume 108B Issue Pages 1253-1254
Keywords
Abstract It is shown that weak field penetration depth measurements can be used to determine the change in the normal and superconducting behaviour of amorphous samples, when heat-treated below the crystallization temperature. The results are used to discuss the validity of BCS-Gorkov relations, when applied to these materials.
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Notes Proceedings of LT-16 Approved no
Call Number BT @ pedrazp @ Serial 558
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Author Esquinazi, P.; de la Cruz, F.
Title Phonon thermal conductivity limited by electron scattering in amorphous Zr70Cu30 Type Journal Article
Year 1983 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 27 Issue 5 Pages 3069-3072
Keywords Zr70Cu30; superconductivity; amorphous
Abstract The low-temperature thermal conductivity of amorphous Zr70Cu30 is investigated. The lattice thermal conductivity as limited by electrons in the superconducting state has been obtained at temperatures close to Tc. This has allowed for the first time the verification of the temperature dependence of the phonon conductivity as predicted by Bardeen, Rickayzen, and Tewordt. The analysis of the data in the normal and superconducting state shows that Matthiessen's rule can be used in amorphous metals to separate the different scattering processes.
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Corporate Author Thesis
Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ 10.1103/PhysRevB.27.3069 Serial 560
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Author Civale, L.; de la Cruz, F.
Title Anomalous behavior of superconducting samples with a fixed number of vortices Type Journal Article
Year 1987 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 36 Issue 7 Pages 3560-3564
Keywords
Abstract We report an anomalous reversible temperature dependence of the magnetization of amorphous type-II superconductors. The experimental results were obtained studying the vortex pinning in samples with very low vortex concentration. The anomaly is shown to be a consequence of the lack of flux quantization in finite samples.
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Corporate Author Thesis
Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ 10.1103/PhysRevB.36.3560 Serial 566
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Author López, D.; Decca, R.; de la Cruz, F.
Title Topological pinning and flux flow in ceramic superconductors Type Journal Article
Year 1991 Publication Solid State Communications Abbreviated Journal
Volume 79 Issue 11 Pages 959-962
Keywords
Abstract The transport current dissipation in the high Tc superconducting ceramic La1.85Sr0.15CuO4−δ shows a sin2 Θ voltage dependence where Θ is the angle between the transport current and the magnetic field. This result and the experimental evidence of an angle independent critical current cannot be explained by the conventional description of flux motion in homogeneous type II superconductors. The results are analyzed in the framework of a granular system where pinning is induced by the topological distribution of current flowing through a multiply connected medium. The dissipation in the superconducting state is found to be due to two additive contributions, one induced by the movement of magnetic flux and the other associated to dissipation in the Josephson junction.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0038-1098 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 808
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Author Guimpel, J.; Monton, C.; Haberkorn, N.; de la Cruz, F.
Title Magnetic behaviour of superconductor/ferromagnet metallic and perovskite based superlattices Type Journal Article
Year 2007 Publication physica status solidi (c) Abbreviated Journal Phys. Status Solidi (c)
Volume 4 Issue 11 Pages 4174-4180
Keywords 74.45.+c; 74.78.Fk; 75.70.Cn
Abstract We present a study of the magnetic behaviour of superconducting/ferromagnetic superlattices, both for metallic and perovskite based systems. In the first case we find that the response is determined by the ferromagnetic layer regime. If these layers are very thin, no ferromagnetism is observed, but the superconducting layers are decoupled, and the superlattice behaves as a stack of independent superconducting films. For thicker ferromagnetic films, ferromagnetism is established and the effective field resulting from the superposition of stray and applied fields dominates the superconducting response of the superlattice. For the perovskite based superlattices, the physical properties are more affected by interface disorder. In this case we have found that the behaviour can be interpeted as charge carrier transfer between both materials, inducing a change in the magnetic character of the manganite. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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Corporate Author Thesis
Publisher WILEY-VCH Verlag Place of Publication Editor
Language Summary Language Original Title (up)
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1610-1642 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ jguimpel @ Serial 620
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Author Safar, H.; Durán, C.; Guimpel, J.; Civale, L.; Luzuriaga, J.; Rodríguez, E.; de la Cruz, F.; Fainstein, C.; Schneemeyer, L.F.; Waszczak, J.V.
Title Logarithmic to nonlogarithmic flux creep transition and magnetic flux hardening in BiSrCaCuO superconducting ceramics Type Journal Article
Year 1989 Publication Physica C: Superconductivity Abbreviated Journal
Volume 162-164, Part 1 Issue Pages 665-666
Keywords
Abstract A sharp temperature and field dependent transition from a logarithmic to a non-logarithmic flux creep behavior has been found in BiSrCaCuO superconductors. The transition is not followed by any noticeable change in the magnetization. However, vibrating reed measurements show that it coincides with a strong hardening of the magnetic structure. The transition occurs at fields and temperatures well below the reversibility line. The possible relation to the recently proposed flux lattice melting is discussed.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0921-4534 ISBN Medium
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Notes Approved no
Call Number BT @ jguimpel @ Serial 626
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Author Safar, H.; Durán, C.; Guimpel, J.; Civale, L.; Luzuriaga, J.; Rodriguez, E.; de la Cruz, F.; Fainstein, C.; Schneemeyer, L.F.; Waszczak, J.V.
Title Logarithmic-to-nonlogarithmic flux-creep transition and magnetic-flux hardening in Bi-Sr-Ca-Cu-O superconducting ceramics Type Journal Article
Year 1989 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 40 Issue 10 Pages 7380
Keywords
Abstract A sharp temperature- and field-dependent transition from a logarithmic to a nonlogarithmic flux-creep behavior has been found in Bi-Sr-Ca-Cu-O superconductors. The transition is not followed by any noticeable change in the magnetization. However, vibrating-reed measurements show that it coincides with a strong hardening of the magnetic structure. The transition occurs at fields and temperatures well below the reversibility line. The possible relation to the recently proposed flux lattice melting is discussed.
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Corporate Author Thesis
Publisher American Physical Society Place of Publication Editor
Language Summary Language Original Title (up)
Series Editor Series Title Abbreviated Series Title
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Notes Approved no
Call Number BT @ jguimpel @ 10.1103/PhysRevB.40.7380 Serial 627
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Author Safar, H.; Rodriguez, E.; de la Cruz, F.; Gammel, P.L.; Schneemeyer, L.F.; Bishop, D.J.
Title Observation of two-dimensional vortices in Bi2Sr2CaCu2Ox Type Journal Article
Year 1992 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 46 Issue 21 Pages 14238-14241
Keywords
Abstract We report transport measurements in the mixed state of single crystals of Bi2Sr2CaCu2Ox using a modified version of the dc flux transformer geometry pioneered by Giaever in low-Tc materials. We find that over a wide range of the phase diagram the vortices are effectively two dimensional in character. Our results suggest that vortex cutting is an efficient process and that it is unlikely that the vortices are strongly entangled in this region of the phase diagram.
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Corporate Author Thesis
Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ 10.1103/PhysRevB.46.14238 Serial 801
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Author Civale, L.; Safar, H.; de la Cruz, F.
Title Percolation and glass behavior in ceramic superconductors: oxygen effects Type Journal Article
Year 1989 Publication Modern Physics Letters B Abbreviated Journal Mod. Phys. Lett. B
Volume 3 Issue 2 Pages 173-181
Keywords
Abstract It is shown that small variations of oxygen content in La1.8Sr0.2CuO4−δ can be used to control the reversible and irreversible magnetization temperature dependence of the superconducting state. A grain bond model is appropriate to describe the superconducting response of the ceramics. The study of the temperature dependence of the magnetization and the resistive transition temperature, in a slightly deoxygenated sample, show that the reversible superconducting state is strongly correlated to superconducting percolation. Deoxygenation has been shown to be an excellent technique to study the time evolution of metastable states induced by currents in the bonds and or in the grains. It is shown that superconducting grains are not correlated to ceramic grains.
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Notes Approved no
Call Number BT @ pedrazp @ Serial 802
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