| Records |
| Author |
de la Cruz, F.; Fink, H.J.; Luzuriaga, J. |
| Title |
Temperature dependence of the superconducting giant-vortex state. Theory and Experiment |
Type  |
Journal Article |
| Year |
1979 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
20 |
Issue |
5 |
Pages |
1947-1959 |
| Keywords |
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| Abstract |
When a type-I superconductor with a surface nucleation field Hc3(T)>Hc(T) (thermodynamic critical field) is thermally cycled in an axially applied magnetic field H0 between the temperatures T(Hc3) and about T(Hc), experiments show that the magnetization changes reversibly. The latter is diamagnetic near T(Hc3) but can be paramagnetic just above T(Hc). This behavior is explained by assuming that the fluxoid quantum number b is fixed at the transition from the normal to the superconducting state and retained at lower temperatures. The value of b is determined almost entirely by the flux at the transition which is enclosed by a contour located at a distance ξ1.7 from the surface inside the cylinder (ξ is the coherence length). The temperature variation of the order parameter f at the surface of the cylinder, the magnetization m, and the temperature at which m=0 for f≠0 are calculated for R>>ξ. Conservation of the fluxoid quantum number, while T is varied causes the two opposing surface currents to become imbalanced. This is the source of the observed para- and diamagnetism. |
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| ISSN |
0163-1829 |
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| Notes |
ISI:A1979HP51300019 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
275 |
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| Author |
Arce, R.; de la Cruz, F.; Guimpel, J. |
| Title |
Superconducting behavior of amorphous Zr70Cu30 |
Type |
Journal Article |
| Year |
1983 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
47 |
Issue |
11 |
Pages |
885-887 |
| Keywords |
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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. |
| Address |
Centro Atómico Bariloche – Instituto Balseiro |
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Edition |
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| ISSN |
0038-1098 |
ISBN |
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Approved |
no |
| Call Number |
BT @ pedrazp @ |
Serial |
532 |
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| Author |
Maiorov, B.; Silhanek, A.V.; De la Cruz, F.; Osquiguil, E. |
| Title |
Comment on “strong vortex liquid correlation from multiterminal measurements on untwinned YBa2Cu3O7-? single crystals” |
Type |
Journal Article |
| Year |
2002 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys Rev Lett |
| Volume |
88 |
Issue |
13 |
Pages |
1397031 |
| Keywords |
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| Abstract |
Multiterminal measurements using experimental technique on twinned and untwinned YBa2Cu3O7-? crystals were presented. Inhomogeneous current distribution acting upon an uncorrelated vortex system showed that the dissipation of voltage at the top was larger than at the bottom. The behavior of the current voltage curves showed that the result Vtop = Vbot was a consequence of the limited voltage sensitivity. |
| Address |
Centro At |
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| ISSN |
00319007 (ISSN) |
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| Notes |
Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; Language of Original Document: English; Correspondence Address: Maiorov, B.; Centro At |
Approved |
no |
| Call Number |
BT @ osquigui @ |
Serial |
368 |
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| Author |
Maiorov, B.; Silhanek, A.V.; De la Cruz, F.; Osquiguil, E.; Rydh, A.; Rapp, |
| Title |
Comment on “strong vortex liquid correlation from multiterminal measurements on untwinned YBa2Cu3O7-? single crystals” [2] (multiple letters) |
Type |
Journal Article |
| Year |
2002 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys Rev Lett |
| Volume |
88 |
Issue |
13 |
Pages |
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| Keywords |
Current voltage characteristics; Electric potential; Extrapolation; Magnetic fields; Melting; Twinning; Vortex flow; Yttrium barium copper oxides; Multiterminal measurements; Single crystals |
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Centro At |
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Edition |
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| ISSN |
00319007 (ISSN) |
ISBN |
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| Notes |
Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; Language of Original Document: English; Correspondence Address: Maiorov, B.; Centro At |
Approved |
no |
| Call Number |
BT @ osquigui @ |
Serial |
369 |
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| Author |
Morré, E.; Grigera, S.; Osquiguil, E.; Nieva, G.; de la Cruz, F. |
| Title |
Angular restrictions on the glass transition and on the c-axis correlated liquid phase in twinned YBa2Cu3O7-? |
Type |
Journal Article |
| Year |
1997 |
Publication |
Physics Letters A |
Abbreviated Journal |
Phys. Lett. A |
| Volume |
233 |
Issue |
1-2 |
Pages |
130-134 |
| Keywords |
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| Abstract |
We have measured the angular dependence of the vortex velocity correlation temperature Tth(H) in twinned YBa2Cu3O7-? single crystals. The data show that the c-axis correlated vortex liquid phase exists up to angles much larger than expected within a single vortex pinning picture. Despite this, the second-order solid-liquid glass transition is shown to be restricted only to external magnetic fields applied within a few degrees from the c-axis direction. |
| Address |
Centro Atómico Bariloche |
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Edition |
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| ISSN |
03759601 |
ISBN |
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| Notes |
Cited By (since 1996): 13; Export Date: 17 April 2009; Source: Scopus; CODEN: PYLAA; Language of Original Document: English; Correspondence Address: Morr |
Approved |
no |
| Call Number |
BT @ osquigui @ |
Serial |
381 |
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| Author |
Decca, R.; Osquiguil, E.; de la Cruz, F.; D'Ovidio, C.; Malachevski, M.T.; Esparza, D. |
| Title |
Non linear temperature dependence of the resistivity of LaSrCuO: Effects of Sr content |
Type |
Journal Article |
| Year |
1989 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
69 |
Issue |
4 |
Pages |
355-357 |
| Keywords |
Ceramic Materials; Lanthanum Compounds--Electric Conductivity; Superconductivity; Ceramic Superconductors; Superconducting Materials |
| 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. |
| Address |
Applied Research Department, Centro At'omico Bariloche |
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Series Issue |
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Edition |
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| ISSN |
00381098 (ISSN) |
ISBN |
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| Notes |
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 |
Approved |
no |
| Call Number |
BT @ osquigui @ |
Serial |
414 |
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| Author |
Osquiguil, E.J.; Civale, L.; Decca, R.; De La Cruz, F. |
| Title |
Metallic to variable-range-hopping transition controlled by oxygen content in La-Sr-Cu-O |
Type |
Journal Article |
| Year |
1988 |
Publication |
Physical Review B |
Abbreviated Journal |
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| Volume |
38 |
Issue |
4 |
Pages |
2840-2842 |
| Keywords |
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| Abstract |
We have performed electrical resistivity measurements on the superconductor La1.8Sr0.2CuO4- over a wide range of temperatures and oxygen concentration. The results provide experimental evidence for a transition from a metallic behavior at high temperatures to a variable-range hopping regime at low temperatures. The transition is controlled by the oxygen content. Correlation between both regimes is also shown. |
| Address |
Centro Atmico Bariloche, Instituto Balseiro, 8400 Bariloche, R |
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Series Issue |
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Edition |
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| ISSN |
01631829 (ISSN) |
ISBN |
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| Notes |
Cited By (since 1996): 6; Export Date: 17 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.38.2840; Language of Original Document: English; Correspondence Address: Osquiguil, E.J.; Centro Atmico Bariloche; Instituto Balseiro 8400 Bariloche, R |
Approved |
no |
| Call Number |
BT @ osquigui @ |
Serial |
415 |
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| Author |
Osquiguil, E.; Decca, R.; Nieva, G.; Civale, L.; de la Cruz, F. |
| Title |
La1.80 Sr0.20 CuO4-delta a clean limit superconductor |
Type |
Journal Article |
| Year |
1988 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
65 |
Issue |
6 |
Pages |
491-494 |
| Keywords |
CERAMIC MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CERAMIC SUPERCONDUCTORS; CLEAN LIMIT SUPERCONDUCTOR; HIGH-TEMPERATURE SUPERCONDUCTORS; OXYGEN CONCENTRATION; SUPERCONDUCTING MATERIALS |
| Abstract |
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. |
| Address |
Instituto Balseiro 8400 Bariloche, R.N., Argentina# # Comisi |
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Edition |
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| ISSN |
00381098 (ISSN) |
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| Notes |
Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Osquiguil, E. |
Approved |
no |
| Call Number |
BT @ osquigui @ |
Serial |
416 |
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| Author |
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 |
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| Volume |
36 |
Issue |
13 |
Pages |
6850-6852 |
| Keywords |
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| 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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01631829 (ISSN) |
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| 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 |
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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Series Issue |
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Edition |
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| ISSN |
00381098 (ISSN) |
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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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