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Author (up) 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 (up) Arce, R.; de la Cruz, F.; Esquinazi, P.
Title Superconducting penetration depth in amorphous metals Type Journal Article
Year 1981 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 38 Issue 12 Pages 1253-1255
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Abstract We show that temperature dependent penetration depth measurements can be used to characterize the superconductive behaviour of amorphous metals.
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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 557
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Author (up) Durán, C.; Esquinazi, P.; Fainstein, C.; Núñez Regueiro, M.
Title Anomalies in the internal friction and sound velocity in YBa2Cu3O7-x and EuBa2Cu3O7-x superconductors Type Journal Article
Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 65 Issue 9 Pages 957-961
Keywords
Abstract Internal friction Q-1 and Young Modulus sound velocity vE measurements at 1 kHz in YBa2Cu3O7?x and EuBa2Cu3O7?x polycrystalline samples reveal anomalies at the superconducting transition and at not, vert, similar37 K. The anomaly in vE at not, vert, similar90 K is accompanied by an absorption peak and is in agreement with published ultrasonic measurements, suggesting a lattice deformation at the superconducting transition.
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ISSN 0038-1098 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 569
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Author (up) Durán, C.; Esquinazi, P.; Luzuriaga, J.; Brandt, E.H.
Title Bc1 of high-Tc La1.8Sr0.2CuO4 and amorphous Zr70Cu30 superconductors measured by a vibrating reed Type Journal Article
Year 1987 Publication Physics Letters A Abbreviated Journal Phys. Lett. A
Volume 123 Issue 9 Pages 485-488
Keywords Zr70Cu30; ZIRCONIUM COPPER ALLOYS – Amorphous
Abstract The lower critical field Bc1 of the high-Tc superconductor La1.8Sr0.2CuO4 (Tc=40 K, Bcless-than-or-equals, slant7.7 mT) and of amorphous Zr70Cu30 (Tc=2.6K, Bc1less-than-or-equals, slant3.8 mT) is obtained from the resonance frequency ?/2? of a vibrating reed made of these materials. At applied magnetic fields Ba<Bc1, ?(Ba)=?i(Ba) as predicted for an ideally diamagnetic reed. Above Bc1 we observe a reversible linear law ?2??2inot, vert, similarB2a?B2c1. This allows a simple definition of Bc1 even in ceramic superconductors into which flux starts to penetrate at Bamuch less-thanBc1 due to their granular structure.
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ISSN 0375-9601 ISBN Medium
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Notes ISI:A1987K407100012 Approved no
Call Number BT @ hernan @ Serial 269
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Author (up) 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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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 (up) Esquinazi, P.; de la Cruz, M.E.; de la Cruz, F.
Title Heat treatment effects in La70Cu30 amorphous system Type Journal Article
Year 1981 Publication Physica B+C Abbreviated Journal
Volume 108B Issue 1-3 Pages 1215-1216
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Abstract It is shown that superconductivity is a useful tool to investigate the evolution of the amorphous state, when heat treatment below the crystallization temperature.
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ISSN 0378-4363 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 530
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Author (up) Esquinazi, P.; de la Cruz, M.E.; Ridner, A.; de la Cruz, F.
Title Heat treatment effects in amorphous metals: Zr70Cu30 and La70Cu30 Type Journal Article
Year 1982 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 44 Issue 6 Pages 941-944
Keywords
Abstract We measured the electrical resistivity (4–300 K), superconducting critical temperature and thermal conductivity (0.5–7 K) of the amorphous metals Zr70Cu30 and La70Cu30. Heat treatments below crystallization temperature induced changes in these properties. In particular, in the first stage of the annealing of Zr70Cu30 there are systematic changes in the thermal conductivity and the critical temperature, while the electrical resistivity remains constant. We show that there is no simple correlation between the thermal conductivity processes in the low temperature and plateau regions. We also show that the thermal conductivity of as quenched La70Cu30 is typical of amorphous metals, contrary to information previously reported.
Address Centro Atómico Bariloche – Instituto Balseiro
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Series Volume Series Issue Edition
ISSN 0038-1098 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 529
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Author (up) Esquinazi, P.; Durán, C.
Title Magnetization and pinning measurements with the vibrating Reed on high-Tc ceramics Type Journal Article
Year 1988 Publication Physica C: Superconductivity Abbreviated Journal Physica C
Volume 153-155 Issue Part 3 Pages 1499-1500
Keywords
Abstract By means of the vibrating reed technique we have measured the lower critical field and the elastic coupling of vortices to pinning centers in La-Sr-Cu-O and Eu-Cu-O ceramics.our results indicate that the diamagnetism probed by the reed and the pinning scaling behaviour depend on the amount of oxygen in the La-based ceramic. In the Eu-based sample the lower critical field has a highly anomalous temperature dependence.
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ISSN 0921-4534 ISBN Medium
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Notes Proceedings of the International Conference on High Temperature Superconductors and Materials and Mechanisms of Superconductivity Part II Approved no
Call Number BT @ pedrazp @ Serial 531
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Author (up) Esquinazi, P.; Durán, C.; Fainstein, C.; Núñez Regueiro, M.
Title Evidence of low-energy tunneling excitations in the high-Tc superconductor YBa2Cu3O7-x Type Journal Article
Year 1988 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 37 Issue 1 Pages 545-547
Keywords
Abstract We have measured the internal friction Q-1 and the Young's-modulus sound velocity vE at 1 kHz for YBa2Cu3O7-x. Below 20 K the relative change in the sound velocity and the temperature dependence of the internal friction perfectly resemble the behavior obtained for Suprasil W. Below 1 K we observe a logarithmic temperature dependence for the sound velocity and between 1 and 5 K a well-defined plateau in the internal friction is obtained. We find quantitative agreement with the predictions of the standard tunneling model which is widely used to explain the low-temperature properties of amorphous materials. The implications of the existence of tunneling systems in these materials are discussed.
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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.37.545 Serial 576
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Author (up) Esquinazi, P.; Guillet, B.; Dussel, H.
Title Caracterización parcial de la evolución estructural del sistema amorfo La70Cu30 Type Manuscript
Year 1984 Publication Abbreviated Journal
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Notes Approved no
Call Number BT @ pedrazp @ Serial 811
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