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Author (up) Causa, M. T.; Dutrús, S. M.; Fainstein, C.; Nieva, G.; Salva, H. R.; Sánchez, R. D.; Steren, L. B.; Tovar, M.; Zysler R.
Title MAGNETIC AND STRUCTURAL PROPERTIES OF SOME ABa2Cu3O7?? SUPERCONDUCTORS Type Journal Article
Year 1987 Publication International Journal of Modern Physics B Abbreviated Journal International Journal of Modern Phys. B
Volume 1 Issue 3-4 Pages 989-992
Keywords
Abstract We report here normal and superconducting properties of ABa2Cu3O7?? (with A=Y, Gd, Dy, and Er) and of Fe doped YBa2Cu3O7??. Results from X-ray powder diffraction, electrical resistivity, magnetic susceptibility, ESR, and specific heat measurements are presented, leading to a characterization of the magnetic properties of these materials. The effect of structural modifications of the lattice on the superconducting properties and the relative insensitivity of Tc to the presence of magnetic moments is discussed.
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ISSN 0217-9792 ISBN Medium
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Notes Approved no
Call Number BT @ gnieva @ Serial 427
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Author (up) 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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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 (up) De La Cruz, F.; Luzuriaga, J.; Martinez, E.N.; Osquiguil, E.J.
Title Current-voltage characteristics in collective pinning Type Journal Article
Year 1987 Publication Physical Review B Abbreviated Journal
Volume 36 Issue 13 Pages 6850-6852
Keywords
Abstract The critical-current curves of amorphous samples which exhibit collective flux pinning have been analyzed, and it was found that the nonlinear part can be fitted by an expression of the form V(I)[(I-IK)/IK]. This form, which could be due to critical behavior, is consistent with an interpretation of the unpinning of vortices in the collective regime as a phase transition between the static flux-line lattice (FLL) and the FLL in steady-state movement as has been proposed by Fisher.
Address Centro Atomico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 01631829 (ISSN) ISBN Medium
Area Expedition Conference
Notes Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.36.6850; Language of Original Document: English; Correspondence Address: De La Cruz, F.; Centro Atomico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina Approved no
Call Number BT @ osquigui @ Serial 417
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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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Series Editor Series Title Abbreviated Series Title
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ISSN 0375-9601 ISBN Medium
Area Expedition Conference
Notes ISI:A1987K407100012 Approved no
Call Number BT @ hernan @ Serial 269
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Author (up) Esparza, D.A.; D'Ovidio, C.A.; Guimpel, J.; Osquiguil, E.; Civale, L.; de la Cruz, F.
Title The granular nature of bulk superconductivity at 40K in La1.8Sr0.2CuO4 Type Journal Article
Year 1987 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 63 Issue 2 Pages 137-140
Keywords CERAMIC MATERIALS; GRANULAR MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CRITICAL FIELDS; HIGH TEMPERATURE SUPERCONDUCTOR; MAGNETIC FLUX EXPULSION; TEMPERATURE DEPENDENCE; SUPERCONDUCTING MATERIALS
Abstract We have measured the electrical resistivity, magnetic flux expulsion and critical fields of the new high temperature superconductor La1.8Sr0.2CuO4 after different heat treatments. Our data show that the complete flux expulsion in these samples is consistent with the presence of shielding currents induced in multiple connected structures. The magnetization measurements indicate that the lowest field where flux penetrates into the sample should not be taken to be the bulk Hcl. It is shown that the absolute value of the electrical resistivity and its temperature dependence are not correlated with the superconducting critical field and temperature. We discuss the behaviour of the superconducting parameters and their relation with the electrical resistivity.
Address Basic Research Department, Centro At
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ISSN 00381098 (ISSN) ISBN Medium
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Notes Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Esparza, D.A.; Applied Research Department; Centro At Approved no
Call Number BT @ osquigui @ Serial 418
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Author (up) Esquinazi, P.; Luzuriaga, J.; Durán, C.; Esparza, D.A.; D'Ovidio, C.
Title Anomalies in the internal friction and sound velocity in the high-temperature superconductor La1.8Sr0.2CuO4 Type Journal Article
Year 1987 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 36 Issue 4 Pages 2316-2318
Keywords
Abstract The internal friction Q-1 and the Young's-modulus sound velocity vE have been measured in La1.8Sr0.2CuO4 using the vibrating-reed technique. Measurements were performed at a frequency of 700 Hz at temperatures between 0.2 and 100 K. A drastic change of slope in the internal friction versus temperature curve is observed at T=44 K just above the superconducting transition temperature Tc=40 K. A plateau in Q-1 is observed between 44 and 5 K. The sound velocity shows a decrease with decreasing temperature between 100 and 20 K and remains almost constant between 2 and 0.2 K.
Address Centro Atomico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina
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 01631829 (ISSN) ISBN Medium
Area Expedition Conference
Notes Cited By (since 1996): 6; Export Date: 28 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.36.2316; Language of Original Document: English; Correspondence Address: Esquinazi, P.; Centro Atomico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina Approved no
Call Number BT @ luzuriag @ Serial 498
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Author (up) Guimpel, J.; de la Cruz, F.; Murduck, J.; Schuller, I.K.
Title Penetration depth of a superconducting superlattice Type Journal Article
Year 1987 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 35 Issue 7 Pages 3655-3656
Keywords
Abstract We have measured the magnetic-flux expulsion of a superconducting superlattice and related it to the Meissner penetration depth. The temperature dependence of the penetration depth is in quantitative agreement with theoretical expectation based on mean-field theory. The zero-temperature penetration depth is found in excellent, quantitative agreement without adjustable parameters with theoretical predictions for dirty superconductors.
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Corporate Author Thesis
Publisher American Physical Society Place of Publication Editor
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Notes Rapid Communications Approved no
Call Number BT @ pedrazp @ 10.1103/PhysRevB.35.3655 Serial 538
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Author (up) Guimpel, Julio
Title Efectos de tamaño en superconductores inhomogeneos Type Book Whole
Year 1987 Publication Abbreviated Journal
Volume Issue Pages
Keywords
Abstract
Address Instituto Balseiro
Corporate Author Thesis Ph.D. thesis
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Notes Approved no
Call Number BT @ hernan @ Serial 347
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Author (up) Luzuriaga, J.
Title Pinning forces and defects as measured by critical currents in amorphous superconducting materials Type Journal Article
Year 1987 Publication Physical Review B Abbreviated Journal
Volume 35 Issue 7 Pages 3625-3628
Keywords
Abstract Analysis of the available data on critical currents in amorphous superconductors shows a striking similarity in the defects responsible for the pinning force in all samples in which two-dimensional flux pinning can be observed. Order-of-magnitude calculations show that this is consistent with the existence of disclinations in glasses as has been proposed in different theoretical papers by Rivier, Nelson, Kleman, and Sadoc. The evolution of pinning forces with annealing also shows a similar behavior in all the published data, and the trend is towards a state with fewer or smaller disclinations. If disclinations are identified with two-level systems this trend is consistent with a decrease of the scattering of phonons by TLS which is observed upon annealing in thermal conductivity measurements.
Address Centro Atomico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina
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Series Editor Series Title Abbreviated Series Title
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ISSN 01631829 (ISSN) ISBN Medium
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Notes Export Date: 28 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.35.3625; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Centro Atomico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina Approved no
Call Number BT @ luzuriag @ Serial 497
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Author (up) Núñez Regueiro, M.; Castello, D.; Izbizky, M.A.; Esparza, D.; D'Ovidio, C.
Title Anomalous thermal conductivity of La2-xSrxCuO4: Possibility of a polaronic glass Type Journal Article
Year 1987 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 36 Issue 16 Pages 8813-8815
Keywords
Abstract e present measurements of the thermal conductivity of La2CuO4 and La1.85Sr0.15CuO4. The results on the pure sample show that lattice conduction is predominant with a T1.8 dependence at low temperatures and a strong T-independent scattering above 30 K. We observe a similar behavior for the superconductor but with a T1.4 law at low temperature and a small electronic contribution in the normal state. These results together with the behavior of the specific heat and sound attenuation are consistent with the existence of a two-level tunneling system for an amorphous state.
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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.36.8813 Serial 574
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