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Author (up) Bud'ko, S.L.; Nakamura, O.; Guimpel, J.; Maple, M.; Schuller, I.K.
Title Anisotropic pressure dependence of the critical temperature of REBa2Cu3O7−δ Type Journal Article
Year 1991 Publication Physica C: Superconductivity Abbreviated Journal
Volume 185-189, Part 3 Issue Pages 1947-1948
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Abstract The hydrostatic pressure dependence of the superconducting critical temperature, Tc, was measured in highly crystalline oriented REBa2Cu3O7−δ (RE=Yb, Dy, Y, Gd) thin films grown on different substrates. The anisotropic strain field induced by the substrate and the different crystalline orientations of the films allows the three strain derivatives of the critical temperature to be estimated. A large anisotropy is found in the ab plane with Tc increasing on compression parallel to the CuO chains and decreasing on compression perpendicular to them. The results on c textured films indicate a non linear relation between Tc and the microscopic parameter which determines its pressure dependence.
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Notes Approved no
Call Number BT @ jguimpel @ Serial 616
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Author (up) Causa, M.T.; Dutrus, S.M.; Fainstein, C.; Nieva, G.; Sanchez, R.; Steren, L.B.; Tovar, M.; Zysler, R.; Oseroff, S.B.; Vier, D.C.; Schultz, S.; Fisk, Z.; Smith, J.L.
Title Magnetic ordering in dilute GdxEu1−xBa2Cu3O7−δ superconductors Type Journal Article
Year 1988 Publication Physica C: Superconductivity Abbreviated Journal Physica C
Volume 153 Issue Pages 188-189
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Abstract We have measured the specific heat of GdxEu1−xBa2Cu3O7−δ (0 ≤ × ≤ 1). The data show a λ-type anomaly at high concentrations and a broad Schottky type anomaly at intermediate and low concentrations. We compare this behavior with theoretical predictions for a 2-dimensional Ising system.
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Call Number BT @ gnieva @ Serial 432
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Author (up) Civale, L.; Pasquini, G.; Levy, P.; Nieva, G.; Casa, D.; Lanza, H.
Title Time relaxation of persistent currents in YBa2Cu3O7−x crystals with columnar defects Type Journal Article
Year 1996 Publication Physica C: Superconductivity Abbreviated Journal Physica C
Volume 263 Issue 1-4 Pages 389-395
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Abstract We have measured the persistent currents and their time relaxation in YBa2Cu3O7−x single crystals with correlated disorder introduced by irradiation with high-energy heavy-ions. For vortex density lower than the defect density, and for applied fields either parallel or nonparallel to the columnar defects, we find clear evidence of a pinning-crossover between a regime of strong individual pinning at low temperatures and a regime of weaker collective pinning at high temperatures. We explore the vortex dynamics above and below this crossover.
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Call Number BT @ gnieva @ Serial 455
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Author (up) D'Anna, G.; Andr
Title Flux-line response in 2H-NbSe2 investigated by means of the vibrating superconductor method Type Journal Article
Year 1993 Publication Physica C: Superconductivity and its applications Abbreviated Journal Phys C Supercond Appl
Volume 218 Issue 1-2 Pages 238-244
Keywords Crystals; Defects; Electric currents; Electric losses; Hydrogenation; Niobium compounds; Phase diagrams; Thermal effects; Critical currents; Flux line response; Hydrogenated niobium selenide single crystals; Peak effect; Transverse AC losses; Vibrating superconductor method; Vortex pinning regime; Superconducting materials
Abstract We measure transverse AC losses in the low- and high-amplitude regime of 2H-NbSe2 single crystals using vibrating superconductor methods. The measurements are sensitive to small deviations of the critical state. The data constitute evidence for a peak effect of the critical current as a function of the temperature in this compound. We construct in the H-T phase diagram the “peak-effect” line which is supposed to mark an abrupt cross-over in the vortex-pinning regime.
Address AT and T Bell Laboratories, Murray Hill, NJ 07974, United States
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ISSN 09214534 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 13; Export Date: 28 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: D'Anna, G.; D Approved no
Call Number BT @ luzuriag @ Serial 521
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Author (up) de la Cruz, F.; Pastoriza, H.; López, D.; Goffman, M. F.; Arribére, A.; Nieva, G.
Title Consequences of 3D-2D vortex decoupling on the phase diagram of HTS Type Journal Article
Year 1994 Publication Physica C: Superconductivity Abbreviated Journal Physica C
Volume 235-240 Issue 1 Pages 83-86
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Abstract We discuss the quench of the long range order in the direction parallel and perpendicular to the field, in the mixed state of BSCCO(2212) and YBCO(123) single crystals. The experimental data show that the high temperature vortex phase in both systems is an uncorrelated liquid phase in all directions.
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Call Number BT @ gnieva @ Serial 453
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Author (up) Dhalle, M.; Boon, W.; Osquiguil, E.; Van Haesendonck, C.; Bruynseraede, Y.; Kwarciak, J.; Van Der Biest, O.
Title Correlation between critical current and resistivity in YBa2Cu3O7 Type Journal Article
Year 1991 Publication Physica C: Superconductivity and its applications Abbreviated Journal Phys C Supercond Appl
Volume 185-189 Issue PART 4 Pages 2447-2448
Keywords Ceramic Materials; Yttrium Compounds--Electric Conductivity; Critical Currents; Oxide Superconductors; Yttrium Barium Copper Oxides; High Temperature Superconductors
Abstract Critical current versus temperature measurements were carried out in ceramic YBa2Cu3O7 samples. The samples were all prepared using the same sintering procedure, but starting from powders obtained by different wet and dry methods. All samples showed a linear Jc vs. T behaviour, typical of Josephson weak-link coupling, with a slope that depends on the preparation method. Using the Ambegaokar-Baratoff relation for Jc, the difference in slopes can be attributed to a change in the characteristic value of the junction resistance. This value turns out to be clearly correlated with the resistivity in the normal state.
Address Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, de Croylaan 2, B-3001 Leuven, Belgium
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Notes Export Date: 17 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: Dhalle, M.; Laboratorium voor Vaste Stof-Fysika en Magnetisme; Katholieke Universiteit Leuven; Celestijnenlaan 200D B-3001 Leuven, Belgium Approved no
Call Number BT @ osquigui @ Serial 410
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Author (up) Dolz, M.I.; Shalóm, D.E.; Pastoriza, H.; López, D.O.
Title Anisotropic response of the moving vortex lattice in superconducting Mo(1−x)Gex amorphous films Type Journal Article
Year 2012 Publication Physica C: Superconductivity Abbreviated Journal
Volume 474 Issue Pages 34-37
Keywords Superconductivity; 2D systems; Transverse critical current; Anisotropic behavior
Abstract We have performed magnetic susceptibility measurements in Mo(1−x)Gex amorphous thin films biased with an electrical current using anisotropic coils. We tested the symmetry of the vortex response changing the relative orientation between the bias current and the susceptibility coils. We found a region in the DC current–temperature phase diagram where the dynamical vortex structures behave anisotropically. In this region the shielding capability of the superconducting currents measured by the susceptibility coils is less effective along the direction of vortex motion compared to the transverse direction. This anisotropic response is found in the same region where the peak effect in the critical current is developed. On rising temperature the isotropic behavior is recovered.
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Call Number BT @ hernan @ Serial 638
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Author (up) El Azrak, A.; de Vaulchier, L.A.; Bontemps, N.; Thivet, C.; Guilloux-Viry, M.; Perrin, A.; Wuyts, B.; Osquiguil, E.
Title Optical and transport measurements of YBa2Cu3O6+x thin films (0.38?x?1) Type Journal Article
Year 1994 Publication Physica C: Superconductivity and its applications Abbreviated Journal Phys C Supercond Appl
Volume 235-240 Issue PART 2 Pages 1431-1432
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Abstract We report optical reflectivity and transmission measurements at room temperature on a set of five YBa2Cu3O6+x films for 0.38?x?, and ?{variant}(T) resistivity data down to 10K, prepared from a single YBa2Cu3O7 thin film. In contrast with x=1, as x decreases, the scattering rate deduced from the optical conductivity departs from its linear variation with ?, in correlation with the absence of linearity of ?{variant}(T) versus temperature.
Address Centro Atomico, 8400 S.C. de Bariloche, R.N., Argentina
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Notes Export Date: 17 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: El Azrak, A.; Optique Physique (UPR 5 CNRS); ESPCI; 10 rue Vauquelin 75231 Paris Cedex 05, France Approved no
Call Number BT @ osquigui @ Serial 388
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Author (up) Esquinazi, P.; Durán, C.
Title Magnetization and pinning measurements with the vibrating Reed on high-Tc ceramics Type Journal Article
Year 1988 Publication Physica C: Superconductivity Abbreviated Journal Physica C
Volume 153-155 Issue Part 3 Pages 1499-1500
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Abstract By means of the vibrating reed technique we have measured the lower critical field and the elastic coupling of vortices to pinning centers in La-Sr-Cu-O and Eu-Cu-O ceramics.our results indicate that the diamagnetism probed by the reed and the pinning scaling behaviour depend on the amount of oxygen in the La-based ceramic. In the Eu-based sample the lower critical field has a highly anomalous temperature dependence.
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Notes Proceedings of the International Conference on High Temperature Superconductors and Materials and Mechanisms of Superconductivity Part II Approved no
Call Number BT @ pedrazp @ Serial 531
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Author (up) Franco, D.G.; Sarmiento-Chavez, A.; Schenone, N.; Allcca, A.E.L.; Berisso, M.G.; Fasano, Y.; Guimpel, J.
Title Characterization of the Nb-B Superlattice System Type Journal Article
Year 2016 Publication Physica C: Superconductivity and its Applications Abbreviated Journal
Volume 531 Issue Pages 93-97
Keywords Superlattice; Superconductivity; Transition Edge Sensors
Abstract Abstract

We study the growth, stacking and superconducting properties of Nb and B thin films and superlattices. The interest in these resides in their possible use in transition edge neutron sensors. The samples were grown by magnetron sputtering over Si (100) substrates. The X-ray diffraction patterns for all Nb containing samples show a Nb (110) preferential orientation. From the low-angle X-ray reflectivity we obtain information on the superlattice structure. The superconducting transition temperatures of the superlattices, obtained from the temperature dependence of the magnetization, are higher than those of single Nb films of similar thickness. The temperature dependence of the perpendicular and parallel upper critical fields indicate that the superlattices behave as an array of decoupled superconducting Nb layers.
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Call Number BT @ jguimpel @ Serial 743
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