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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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ISSN 00381098 (ISSN) ISBN Medium
Area Expedition Conference
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
Volume 38 Issue 4 Pages 2840-2842
Keywords
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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Publisher Place of Publication Editor
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition (up)
ISSN 01631829 (ISSN) ISBN Medium
Area Expedition Conference
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
Corporate Author Thesis
Publisher Place of Publication Editor
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Series Editor Series Title Abbreviated Series Title
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ISSN 00381098 (ISSN) ISBN Medium
Area Expedition Conference
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
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
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 (up)
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 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
Corporate Author Thesis
Publisher Place of Publication Editor
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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 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
Keywords
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.
Address Centro At
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ISSN 00381098 (ISSN) ISBN Medium
Area Expedition Conference
Notes Cited By (since 1996): 1; Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Martinez, E.N. Approved 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.
Address Centro Atómico Bariloche – Instituto Balseiro, 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 00381098 (ISSN) ISBN Medium
Area Expedition Conference
Notes 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 Approved no
Call Number BT @ osquigui @ Serial 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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Call Number BT @ gnieva @ Serial 426
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Author Osquiguil, E.; Civale, L.; Decca, R.; Safar, H.; Martinez, E.; Nieva, G.; de la Cruz, F.
Title The Granular Behavior of LaSrCuO: Oxygen Concentration Effects on the Electrical Resistivity Type Book Chapter
Year 1988 Publication High Temperature Superconductors, Mat. Res. Soc. Symposium Proceedings Abbreviated Journal
Volume 99 Issue Pages 985
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Abstract
Address
Corporate Author Thesis
Publisher Mater. Res. Soc. Place of Publication Pittsburgh, PA Editor ed. M.B. Brosdky, R. C. Dynes, K. Kitazawa and H. L. Tutler
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Notes Approved no
Call Number BT @ gnieva @ Serial 431
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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
Keywords
Abstract 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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Notes Approved no
Call Number BT @ gnieva @ Serial 442
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