| Records |
| 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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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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| Call Number |
BT @ osquigui @ |
Serial |
414 |
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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. |
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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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BT @ osquigui @ |
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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 |
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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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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 |
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BT @ osquigui @ |
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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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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. |
| Title |
Dimensional crossovers in collective flux pinning |
Type |
Journal Article |
| Year |
1986 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun |
| Volume |
60 |
Issue |
2 |
Pages |
151-155 |
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| Abstract |
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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no |
| Call Number |
BT @ osquigui @ |
Serial |
419 |
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| Author |
Osquiguil, E.; Frank, V.L.P.; de la Cruz, F. |
| Title |
Two dimensional collective flux pinning in melt spun superconducting amorphous Zr70Cu30 |
Type |
Journal Article |
| Year |
1985 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
55 |
Issue |
3 |
Pages |
227-230 |
| Keywords |
ZIRCONIUM COPPER ALLOYS – Amorphous; CRITICAL CURRENTS; PINNING FORCES; SUPERCONDUCTING MATERIALS |
| 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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no |
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BT @ osquigui @ |
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420 |
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| Author |
Nieva,G.; Martinez, E. N.; de la Cruz, F.; Esparza, D. A.; D'Ovidio, C. A. |
| Title |
Specific heat of La1.8Sr0.2CuO4: Anomaly at the superconducting transition |
Type |
Journal Article |
| Year |
1987 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
36 |
Issue |
16 |
Pages |
8780 - 8782 |
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no |
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BT @ gnieva @ |
Serial |
426 |
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| Author |
López, D.; Rodríguez, E.; Nieva, G.; de la Cruz, F.; Cheong, S. W. |
| Title |
Three-dimensional vortex flux flow in LSCO and YBCO through pseudo dc flux transformer measurements |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physica B: Condensed Matter |
Abbreviated Journal |
Physica B |
| Volume |
194-196 |
Issue |
2 |
Pages |
1977-1978 |
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A pseudo dc flux transformer configuration shows that the flux flow in La2−xSrxCuO4 (x=0.075) and YBa2Cu3O7 single crystals is due to the movement of 3-D vortices across the sample. We show that the loss of c-axis long range vortex correlation is achieved either by thermal fluctuations or by an inhomogeneus Lorentz force acting on the vortices. |
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no |
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BT @ gnieva @ |
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442 |
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Safar, H.; Gammel, P.L.; Huse, D.A.; Majumdar, S.N.; Schneemeyer, L.F.; Bishop, D.J.; Lopez, D.; Nieva, G.L.; de la Cruz, F. |
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Observation of a nonlocal conductivity in the mixed state of YBa2Cu3O7-d: Experimental evidence for a vortex line liquid |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
| Volume |
72 |
Issue |
8 |
Pages |
1272 |
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We report on transport measurements in the mixed state of YBa2Cu3O7 single crystals using the dc flux transformer geometry. In the vortex fluid regime we have observed the onset of a nonlocal conductivity. At lower temperatures, close to but above the phase transition temperature the vortices become effectively three dimensional in character. This is in sharp contrast to recent flux transformer experiments on Bi2Sr2CaCu2O which have failed to see a nonlocal conductivity, confirming the two-dimensional character at high temperatures of the vortices in that system. These observations suggest that in a finite temperature interval, the vortex state in YBa2Cu3O7 is a line liquid. |
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no |
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BT @ gnieva @ |
Serial |
443 |
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| Author |
López, D.; Nieva, G.; de la Cruz, F. |
| Title |
In- and out-of-plane vortex correlations in YBa2Cu3O7 |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
50 |
Issue |
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Pages |
7219 |
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BT @ gnieva @ |
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444 |
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