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Author Herbsommer, J.A.; Correa, V.F.; Nieva, G.; Pastoriza, H.; Luzuriaga, J.
Title (down) Vortex dynamics in Bi2Sr2CaCu2O8+δ single crystals with planar defects Type Journal Article
Year 2001 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 120 Issue 2-3 Pages 59-63
Keywords
Abstract We have studied the effects of c-axis correlated planar defects on the vortex lattice of Bi$2$Sr$2$CaCu$8$ single crystals using Bitter decoration, transverse ac permeability and X-ray measurements. Our results show that the low field low temperature phase coherent vortex lattice exhibits anisotropic pinning in the presence of these planar defects. Frequency dependent ac permeability measurements show that the ordered solid-liquid transition is first order as in samples free of correlated defects. However, the melting point is detected only when the excitation field is along the defects.
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Call Number BT @ hernan @ herbsommer01 Serial 23
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Author Osquiguil, E.; Frank, V.L.P.; de la Cruz, F.
Title (down) 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
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ISSN 00381098 (ISSN) ISBN Medium
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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 Castello, D.; Jaime, M.; Núñez Regueiro, M.
Title (down) Thermal conductivity of high temperature superconductor TlBaCaCuO Type Journal Article
Year 1991 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 79 Issue 11 Pages 967-970
Keywords
Abstract We have measured the thermal conductivity of ceramic samples of TlBaCaCuO between 2 and 250 K. At high temperatures it follows a constant behaviour down to the superconducting transition temperature where a sudden increase of the thermal conductivity occurs, attributed to reduced phonon scattering by condensating electrons. At low temperatures a T2 law is observed, confirming the assumption that it is a common feature in most of the high temperature superconducting oxides. Phonon scattering against tunneling systems analogous to those found in amorphous solids can explain this behaviour.
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Call Number BT @ pedrazp @ Serial 581
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Author Daudin, B.
Title (down) Thermal conductivity of amorphous La70Cu30 Type Journal Article
Year 1981 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 37 Issue 2 Pages 149-152
Keywords La70Cu30; superconductivity; amorphous
Abstract We have measured in a temperature range of 0.6 to 6.5 K the thermal conductivity of various samples of amorphous La70Cu30 prepared by ultra rapid quenching. Below the superconducting critical temperature (Tc=3.85K) we found the classical amorphous behaviour and determined the coupling constant n0M2. Above Tc we found that the thermal conductivity was governed by the electron-phonon interaction and we discuss the results obtained.
Address Centro Atómico Bariloche – Instituto Balseiro
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ISSN 0038-1098 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 556
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Author Núñez Regueiro, M.; Izbizky, M.A.; Esquinazi, P.
Title (down) Thermal conductivity and “disorder” in high temperature superconductors Type Journal Article
Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 67 Issue 4 Pages 401-404
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Abstract We analyze the controversial thermal conductivity results on high temperature superconductors by scaling the data with material parameters to compare them to other materials with similar behaviour. We show that they have the same general features observed in amorphous and disordered crystalline materials. Possible origins of the disorder are discussed.
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Notes Approved no
Call Number BT @ pedrazp @ Serial 583
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Author Esparza, D.A.; D'Ovidio, C.A.; Guimpel, J.; Osquiguil, E.; Civale, L.; de la Cruz, F.
Title (down) 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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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 Arce, R.; Civale, L.; Luzuriaga, J.; Guimpel, J.; de la Cruz, F.
Title (down) Surface normal regions in superconducting Zr70Cu30 induced by thermal relaxation Type Journal Article
Year 1983 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 48 Issue 12 Pages 1027-1030
Keywords ZIRCONIUM COPPER ALLOYS – Physical Properties; SUPERCONDUCTING MATERIALS
Abstract Penetration depth measurements show that thermal heat treatment in amorphous Zr70Cu30 induces a normal region 5000 Å thick at the surface of ultrarapid quenched ribbons. Upper critical field measurements indicate that the new induced phase is a normal one while the rest of the sample remains as a homogeneous superconducting phase.
Address Centro Atómico Bariloche – Instituto Balseiro
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ISSN 00381098 (ISSN) ISBN Medium
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Notes Export Date: 28 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Arce, R.; Centro At Approved no
Call Number BT @ luzuriag @ Serial 502
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Author Huber, J.G.; Bulman, J.B.; Sereni, J.G.
Title (down) Superconductivity under pressure and low temperature specific heat of ThPr alloys Type Journal Article
Year 1982 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 43 Issue 12 Pages 925-931
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Abstract Measurements of superconducting transition temperature under pressure and low temperature specific heat are presented for ThPr alloys. At 18.2 kbar the normal- to superconducting-state phase boundary extends beyond 50 at.% Pr. This system is discussed in terms of a non-magnetic singlet ground state for the Pr3+ ions due to crystal field splitting. A splitting scheme which varies with Pr concentration is proposed.
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Notes ISI:A1982PG48200012 Approved no
Call Number BT @ hernan @ Serial 134
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Author Kim, J.; Haberkorn, N.; Gofryk, K.; Graf, M.J.; Ronning, F.; Sefat, A.S.; Movshovich, R.; Civale, L.
Title (down) Superconducting properties in heavily overdoped Ba(Fe0.86Co0.14)2As2 single crystals Type Journal Article
Year 2015 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 201 Issue Pages 20-24
Keywords A. Iron arsenide superconductors; B. Upper critical field; C. Magnetic penetration depth; D. Vortex pinning
Abstract Abstract

We report the intrinsic superconducting parameters in a heavily overdoped Ba(Fe1−xCox)2As2 (x=0.14) single crystal and their influence in the resulting vortex dynamics. We find a bulk superconducting critical temperature of 9.8 K, magnetic penetration depth λab (0)=660±50 nm, coherence length ξab (0)=6.4±0.2 nm, and the upper critical field anisotropy γT→Tc≈3.7. The vortex phase diagram, in comparison with the optimally doped compound, presents a narrow collective creep regime. The intrinsic pinning energy plays an important role in the resulting vortex dynamics as compared with similar pinning landscape and comparable intrinsic thermal fluctuations.
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Notes Approved no
Call Number BT @ pedrazp @ Serial 724
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Author Arce, R.; de la Cruz, F.; Esquinazi, P.
Title (down) 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 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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Notes Approved no
Call Number BT @ pedrazp @ Serial 557
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