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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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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: Osquiguil, E. Approved no
Call Number BT @ osquigui @ Serial 416
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Author Sarkar, R.; Baenitz, M.; Sereni, J.G.; Geibel, C.
Title 29Si NMR study of the heavy fermion system CeRuSi Type Journal Article
Year 2010 Publication Journal of Physics: Conference Series Abbreviated Journal J. Phys. Conf. Ser.
Volume 200 Issue Pages 012173
Keywords Basal planes; Energy scale; Heavy fermion systems; High-T; Kondo temperatures; Local probes; Low energies; NMR studies; Powder spectra; Drops; Silicon
Abstract A recent investigation of the low temperature properties of the paramagnetic heavy fermion system CeRuSi revealed an anomalous decrease of the coefficient C/T below 6 K, indicating a second low energy scale well below the Kondo temperature of about 50 K. We started an investigation of this unusual behavior using the local probe 29Si-NMR. Here a preliminary 29Si field sweep NMR study in the temperature 4.2-200 K is reported. 29Si-NMR powder spectra obtained at 72.9 MHz could be simulated and shift components 29Kab(T) and 29K c(T) were determined. The shift along the basal plane 29Kab(T) shows the expected behavior with a Curie-Weiss dependence at high T merging in a constant value below 15 K. In contrast the shift along the tetragonal axis reveals an anomalous T dependence below 15 K where 29Kc(T) drops by a factor of 2, confirming the presence of a further low T energy scale. We suspect this drop to be related to the anomalous decrease of C/T below 6 K and discuss possible mechanism. © 2010 IOP Publishing Ltd.
Address Divisin Bajas Temperaturas, Centro Atmico Bariloche, Comisin Nacional de Energia Atmica, cc 439, 8400 San Carlos de Bariloche, Argentina
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Publisher Place of Publication Karlsruhe Editor
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Series Editor Series Title International Conference on Magnetism, ICM 2009 Abbreviated Series Title
Series Volume 200 Series Issue SECTION 1 Edition
ISSN 17426588 (ISSN) ISBN Medium
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Notes Conference code: 81773; Export Date: 10 December 2010; Source: Scopus; Art. No.: 012173; doi: 10.1088/1742-6596/200/1/012173; Language of Original Document: English; Correspondence Address: Sarkar, R.; Max-Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany; email: rajibsarkarsinp@gmail.com; References: Sereni, J.G., J. Phys.: Condens. Matter., , submitted to; Welter, R., (1992) J. Alloys Comput., 189 (1), p. 49; Chevalier, B., (2008) Phys. Rev., 77 (1), p. 014414; Rebelsky, L., (1988) J. Appl.Phys., 63 (8), p. 3405; Kitaoka, Y., (1985) J. Phys. Soc. Japan., 54 (9), p. 3236; Krishna-Murthy, H.R., (1975) Phys. Rev. Lett., 35 (16), p. 1101; Chevalier, B., (2006) Physica, 378-380, p. 795; Kim, J.K., Troyer, M., (1998) Phys. Rev. Letter, 80 (12), p. 2705 Approved no
Call Number BT @ berisso @ Serial 598
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Author Rumi, G.; Albornoz, L.J.; Pedrazzini, P.; Dolz, M.I.; Pastoriza, H.; van der Beek, C.J.; Konczykowski, M.; Fasano, Y.
Title Entropy jump at the first-order vortex phase transition in Bi2Sr2CaCu2O8+δ with columnar defects Type Journal Article
Year 2019 Publication Materials Today: Proceedings Abbreviated Journal XXIII Latin American Symposium on Solid State Physics (SLAFES XXIII), San Carlos de Bariloche, Argen
Volume 14 Issue Pages 30-33
Keywords vortex matter; first-order melting transition; high-temperature superconductivity; correlated disorder
Abstract We study the entropy jump associated with the first-order vortex melting transition (FOT) in Bi2Sr2CaCu2O8+δ crystals by means of Hall probe magnetometry. The samples present a diluted distribution of columnar defects (CD) introduced by irradiation with Xe ions. The FOT is detected in ac transmittivity measurements as a paramagnetic peak, the height of which is proportional to the enthalpy difference entailed by the transition. By applying the Clausius-Clapeyron relation, we quantify the evolution of the entropy jump Δs as a function of the FOT temperature, TFOT, in both pristine crystals and crystals with CD. On increasing the density of CD, Δs decreases monotonically with respect to values found in pristine samples. The Δs versus TFOT dependence in the case of pristine samples follows reasonably well the theoretical prediction of dominant electromagnetic coupling for a model neglecting the effect of disorder. The data for samples with a diluted distribution of CD are not properly described by such a theoretical model.
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ISSN 2214-7853 ISBN Medium
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Call Number BT @ pedrazp @ Serial 853
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Author Navarro, H.; Sirena, M.; Kim, J.; Haberkorn, N.
Title Josephson coupling in high-Tc superconducting junctions using ultra-thin BaTiO3 barriers Type Journal Article
Year 2020 Publication Materials Science and Engineering: B Abbreviated Journal Mater. Sci. Eng. B
Volume 262 Issue Pages 114714
Keywords Josephson junctionsHigh-Tc superconductorsThin films
Abstract We study the electrical transport of vertically-stacked Josephson tunnel junctions using GdBa2Cu3O7−δ electrodes and a BaTiO3 barrier with thicknesses between 1 nm and 3 nm. Current-voltage measurements at low temperatures show a Josephson coupling for junctions with BaTiO3 barriers of 1 nm and 2 nm. Reducing the barrier thickness bellow a critical thickness seems to suppress the ferroelectric nature of the BaTiO3. The Josephson coupling temperature reduces as the barrier thicknesses increases. The Josephson energies at 12 K are of ≈ 1.5 mV and ≈ 7.5 mV for BaTiO3 barriers of 1 nm and 2 nm, respectively. Fraunhofer patterns are consistent with fluctuations in the critical current due to structural inhomogeneities in the barriers. Our results are promising for the development of Josephson junctions using high-Tc electrodes with energy gaps much higher than those usually present in conventional low-temperature superconductors.
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ISSN 0921-5107 ISBN Medium
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Call Number BT @ pedrazp @ Serial 858
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