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Author |
de la Cruz, M.E.; Godfrin, E.J.P.; de la Cruz, F.; de Allende, C. |
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Title |
Superconducting intermediate state in cadmium |
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Journal Article |
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Year |
1976 |
Publication  |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
18 |
Issue |
6 |
Pages |
747-749 |
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Abstract |
Perpendicular magnetic critical fields for cadmium foils were measured to thicknesses below the temperature dependent coherence length. The presence of supercooling indicates first-order thermodynamic transitions for all samples. A modification of Davies' model leads to a good fit of the experimental data. |
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0038-1098 |
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BT @ pedrazp @ |
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528 |
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Author |
Esquinazi, P.; de la Cruz, M.E.; Ridner, A.; de la Cruz, F. |
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Title |
Heat treatment effects in amorphous metals: Zr70Cu30 and La70Cu30 |
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Journal Article |
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Year |
1982 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
44 |
Issue |
6 |
Pages |
941-944 |
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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. |
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Centro Atómico Bariloche – Instituto Balseiro |
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0038-1098 |
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BT @ pedrazp @ |
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529 |
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Author |
Kaufman, H.L.; de la Cruz, F. |
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Title |
Fluctuation induced diamagnetism in aluminum |
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Journal Article |
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Year |
1971 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
9 |
Issue |
20 |
Pages |
1729-1732 |
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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. |
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0038-1098 |
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BT @ pedrazp @ |
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803 |
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Author |
Arce, R.; de la Cruz, F.; Guimpel, J. |
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Title |
Superconducting behavior of amorphous Zr70Cu30 |
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Journal Article |
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Year |
1983 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
47 |
Issue |
11 |
Pages |
885-887 |
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Abstract |
Measurement of the Meissner penetration depth, λ(T) were made in amorphous Zr70Cu30 samples. The results indicate that this amorphous alloy behaves as a BCS superconductor with 2Δ(0)+45 degree rulekTc = 3.8, where Δ(0) is the superconducting energy gap at T=0 and Tc the critical temperature. It is also concluded that the low energy excitation, TLS, characteristics of amorphous material does not contribute to Tc. |
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Centro Atómico Bariloche – Instituto Balseiro |
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0038-1098 |
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BT @ pedrazp @ |
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532 |
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Decca, R.; Osquiguil, E.; de la Cruz, F.; D'Ovidio, C.; Malachevski, M.T.; Esparza, D. |
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Title |
Non linear temperature dependence of the resistivity of LaSrCuO: Effects of Sr content |
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Journal Article |
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Year |
1989 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
69 |
Issue |
4 |
Pages |
355-357 |
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Keywords |
Ceramic Materials; Lanthanum Compounds--Electric Conductivity; Superconductivity; Ceramic Superconductors; Superconducting Materials |
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Abstract |
The linear temperature dependence of the electrical resistivity has been taken to be one of the characteristic features of the ceramic superconductors. Measurements of the electrical resistance of the LaSrCuO system in a wide temperature range show that the previous statement is only an approximation valid for some values of the Sr concentration. |
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Applied Research Department, Centro At'omico Bariloche |
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00381098 (ISSN) |
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Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Decca, R.; Basic Research Department; Centro At |
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BT @ osquigui @ |
Serial |
414 |
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Osquiguil, E.; Decca, R.; Nieva, G.; Civale, L.; de la Cruz, F. |
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Title |
La1.80 Sr0.20 CuO4-delta a clean limit superconductor |
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Journal Article |
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Year |
1988 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
65 |
Issue |
6 |
Pages |
491-494 |
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Keywords |
CERAMIC MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CERAMIC SUPERCONDUCTORS; CLEAN LIMIT SUPERCONDUCTOR; HIGH-TEMPERATURE SUPERCONDUCTORS; OXYGEN CONCENTRATION; SUPERCONDUCTING MATERIALS |
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The electrical resistivity of the superconductor La1.80Sr0.20Cu04-? has been measured in a wide range of temperatures as a function of oxygen and vacuum heat treatments. The resistivity changes reversibly orders of magnitude with oxygen concentration. There is no sign of saturation at high temperatures, even for samples where the resistivity is increased by heat treatment in vacuum. Using the experimental data and general arguments it is concluded that the ceramic superconductors are high ? materials in the clean limit. |
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Instituto Balseiro 8400 Bariloche, R.N., Argentina# # Comisi |
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00381098 (ISSN) |
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Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Osquiguil, E. |
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Call Number |
BT @ osquigui @ |
Serial |
416 |
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Author |
Esparza, D.A.; D'Ovidio, C.A.; Guimpel, J.; Osquiguil, E.; Civale, L.; de la Cruz, F. |
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Title |
The granular nature of bulk superconductivity at 40K in La1.8Sr0.2CuO4 |
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Journal Article |
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Year |
1987 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
63 |
Issue |
2 |
Pages |
137-140 |
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Keywords |
CERAMIC MATERIALS; GRANULAR MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CRITICAL FIELDS; HIGH TEMPERATURE SUPERCONDUCTOR; MAGNETIC FLUX EXPULSION; TEMPERATURE DEPENDENCE; SUPERCONDUCTING MATERIALS |
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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. |
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Basic Research Department, Centro At |
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00381098 (ISSN) |
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Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Esparza, D.A.; Applied Research Department; Centro At |
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BT @ osquigui @ |
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418 |
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Author |
Martinez, E.N.; Frank, V.L.P.; Osquiguil, E.J.; de la Cruz, F. |
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Title |
Dimensional crossovers in collective flux pinning |
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Journal Article |
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Year |
1986 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun |
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60 |
Issue |
2 |
Pages |
151-155 |
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The pinning force density in ribbons of melt spun (a) Zr70Cu30 is found to obey the Larkin-Ovchinnikov theory of collective pinning by dislocation loops, and shows two and three dimensional behaviour, besides an intermediate regime not contemplated by the theory. The dimensional crossovers allow determination of the radius of action of the pinning forces which is shown to be proportional to the coherence length. Its magnitude is too small, which points to quantitative shortcomings of the current theory. |
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Centro At |
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00381098 (ISSN) |
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Cited By (since 1996): 1; Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Martinez, E.N. |
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BT @ osquigui @ |
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419 |
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Author |
Osquiguil, E.; Frank, V.L.P.; de la Cruz, F. |
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Title |
Two dimensional collective flux pinning in melt spun superconducting amorphous Zr70Cu30 |
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Journal Article |
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Year |
1985 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
55 |
Issue |
3 |
Pages |
227-230 |
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Keywords |
ZIRCONIUM COPPER ALLOYS – Amorphous; CRITICAL CURRENTS; PINNING FORCES; SUPERCONDUCTING MATERIALS |
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Abstract |
We have measured the critical currents in melt spun amorphous Zr70Cu30 and their evolution with heat treatment. We found that the pinning forces may be interpreted in terms of the Larkin-Ovchinnikov two dimensional collective pinning theory. |
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Centro Atómico Bariloche – Instituto Balseiro, Argentina |
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00381098 (ISSN) |
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Cited By (since 1996): 1; Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Osquiguil, E.J.; Centro At |
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BT @ osquigui @ |
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420 |
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Author |
Arce, R.; de la Cruz, F.; Fink, H.J. |
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Title |
Model relating superconductive penetration depth and metallurgical phase separation in amorphous La70Cu30 |
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Journal Article |
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Year |
1982 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
42 |
Issue |
8 |
Pages |
575-577 |
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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. |
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0038-1098 |
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BT @ pedrazp @ |
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567 |
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