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Author Izbizky, M.A.; Núñez Regueiro, M.; Esquinazi, P.; Fainstein, C.
Title Thermal conductivity and superconductivity in EuBa2Cu3O7-x Type Journal Article
Year 1988 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 38 Issue 13 Pages (down) 9220-9223
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Abstract
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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.38.9220 Serial 573
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Author Esquinazi, P.; Luzuriaga, J.
Title Annealing effects on the sound velocity and internal friction in the superconducting and normal states of the Cu30Zr70 amorphous alloy Type Journal Article
Year 1988 Publication Physical Review B Abbreviated Journal
Volume 37 Issue 13 Pages (down) 7819-7831
Keywords Zr70Cu30
Abstract By means of the vibrating-reed technique we have measured the evolution upon low-temperature annealing of the internal friction Q-1 and sound velocity v of the Cu30Zr70 amorphous alloy between 0.1 and 10 K. With an applied magnetic field of 5.6 T we measured also the normal-state behavior of both properties. Upon annealing, the internal friction and the slope of the logarithmic temperature dependence of v in the superconducting state decrease, in agreement with the standard tunneling model. Our results indicate that with thermal treatments, the coupling constant between tunneling systems (TSs) and phonons decreases, and the density of states of the TS remains constant or decreases, at most 25%, in the fully relaxed state, which is in agreement with published specific-heat results in these materials. From our data we conclude that the coupling constant between the TS and phonons should be very sensitive to the relaxed state of the disordered structure. The sound-velocity behavior strongly indicates that relaxation processes up to 10 K involve the interaction with the TS. A well-defined change of slope in v at the superconducting critical temperature Tc is observed in the as-quenched and the first relaxed state, which cannot be explained with the standard tunneling model and the Korringa-like relaxation rate between the TS and electrons. Several features observed in the superconducting and normal states lead to the conclusion that the TS-electron interaction problem remains unsolved.
Address Centro Atómico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina
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ISSN 01631829 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 9; Export Date: 28 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.37.7819; Language of Original Document: English; Correspondence Address: Esquinazi, P.; Centro Atmico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina Approved no
Call Number BT @ luzuriag @ Serial 494
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Author Esquinazi, P.; Luzuriaga, J.; Durán, C.
Title Vibrating-reed studies of flux pinning in the superconducting metallic glass Zr70Cu30 Type Journal Article
Year 1988 Publication Physical Review B Abbreviated Journal
Volume 37 Issue 7 Pages (down) 3689-3692
Keywords
Abstract With the vibrating-reed technique we have measured the resonance frequency and damping of superconducting ribbons of a Zr70Cu30 amorphous alloy as a function of magnetic field and temperature for different heat treatments of the same sample. Through these measurements we obtain the Labusch parameter in the reduced-field (b) range 5
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
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ISSN 01631829 (ISSN) ISBN Medium
Area Expedition Conference
Notes Export Date: 28 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.37.3689; Language of Original Document: English; Correspondence Address: Esquinazi, P.; Centro Atomico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina Approved no
Call Number BT @ luzuriag @ Serial 495
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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 (down) 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 Favaron, J.; de la Cruz, M.E.; Esquinazi, P.; de la Cruz, F.
Title Phase diagram and superconductive properties of splat-cooled CuxLa1-x Type Journal Article
Year 1980 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 21 Issue 7 Pages (down) 2804-2808
Keywords
Abstract The phase diagram of nonequilibrium, splat-cooled CuxLa1-x is interpreted by means of superconductive-transition and x-ray measurements. At the eutectic composition the material is shown to be in a highly disordered state. Measurements of dc resistance and ac susceptibility show that there are two different critical fields at the disordered concentration although there is a unique critical temperature.
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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 @ PhysRevB.21.2804 Serial 535
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Author 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 (down) 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 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 (down) 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 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 (down) 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 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 (down) 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, 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 (down) 1215-1216
Keywords
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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Language Summary Language Original Title
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ISSN 0378-4363 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 530
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