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Author Arce, R.; de la Cruz, F.; Esquinazi, P. url  doi
openurl 
  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.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Proceedings of LT-16 Approved no  
  Call Number BT @ pedrazp @ Serial (up) 558  
Permanent link to this record
 
 
Author Esquinazi, P.; de la Cruz, F. url  doi
openurl 
  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.  
  Address  
  Corporate Author Thesis  
  Publisher American Physical Society Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ 10.1103/PhysRevB.27.3069 Serial (up) 560  
Permanent link to this record
 
 
Author Civale, L.; de la Cruz, F. url  doi
openurl 
  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.  
  Address  
  Corporate Author Thesis  
  Publisher American Physical Society Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ 10.1103/PhysRevB.36.3560 Serial (up) 566  
Permanent link to this record
 
 
Author Arce, R.; de la Cruz, F.; Fink, H.J. url  doi
openurl 
  Title Model relating superconductive penetration depth and metallurgical phase separation in amorphous La70Cu30 Type Journal Article
  Year 1982 Publication Solid State Communications Abbreviated Journal Solid State Commun.  
  Volume 42 Issue 8 Pages 575-577  
  Keywords  
  Abstract A model is proposed to account for the large increase in the measured penetration depth of superconducting, amorphous La70Cu30 when the specimens are annealed sufficiently long near, but below, the crystallization temperature. It is suggested that a metallurgical phase separation occurs with domain dimensions in the submicrometer range. Penetration depth measurements as a function of temperature in a weak magnetic field are a useful tool to detect changes in phase separation in high-K materials.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  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 (up) 567  
Permanent link to this record
 
 
Author Guimpel, J.; Monton, C.; Haberkorn, N.; de la Cruz, F. doi  openurl
  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)  
  Address  
  Corporate Author Thesis  
  Publisher WILEY-VCH Verlag Place of Publication Editor  
  Language Summary Language Original Title  
  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 (up) 620  
Permanent link to this record
 
 
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. url  doi
openurl 
  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.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0921-4534 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ jguimpel @ Serial (up) 626  
Permanent link to this record
 
 
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. url  doi
openurl 
  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.  
  Address  
  Corporate Author Thesis  
  Publisher American Physical Society Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ jguimpel @ 10.1103/PhysRevB.40.7380 Serial (up) 627  
Permanent link to this record
 
 
Author Safar, H.; Rodriguez, E.; de la Cruz, F.; Gammel, P.L.; Schneemeyer, L.F.; Bishop, D.J. url  doi
openurl 
  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.  
  Address  
  Corporate Author Thesis  
  Publisher American Physical Society Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ 10.1103/PhysRevB.46.14238 Serial (up) 801  
Permanent link to this record
 
 
Author Civale, L.; Safar, H.; de la Cruz, F. url  doi
openurl 
  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.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial (up) 802  
Permanent link to this record
 
 
Author Kaufman, H.L.; de la Cruz, F. url  doi
openurl 
  Title Fluctuation induced diamagnetism in aluminum Type Journal Article
  Year 1971 Publication Solid State Communications Abbreviated Journal Solid State Commun.  
  Volume 9 Issue 20 Pages 1729-1732  
  Keywords  
  Abstract The magnetic field and temperature dependence of the magnetization of bulk aluminum near the normal-superconductor transition has been measured. Due to the large amount of supercooling in one of the samples it was possible to extend the measurements well below the critical temperature. A comparison of the experimental results with theory is presented.

Résumé

Nous avons mesuré la dépendance en champ magnétique et en température de la magnétisation d'un échantillon massif d'aluminium au voisinage de la transition état normal-état supraconducteur. Grâce au ‘supercooling’ important d'un des échantillon, nous avons pu étendre nos mesures bien au dessous de la température critique. Nous comparons les résultats expérimentaux à la théorie.		  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  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 (up) 803  
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