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Author Dolz, M.I.; Kolton, A.B.; Pastoriza, H.
Title Direct determination of the collective pinning radius in the cuprate superconductor Bi2 Sr2 CaCu2 O8+ delta Type Journal Article
Year 2010 Publication Physical Review B Abbreviated Journal PRB
Volume (down) 81 Issue 9 Pages 092502
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Abstract We study the onset of the irreversible magnetic behavior of vortex matter in micron-sized Bi2Sr2CaCu2O8+δ single crystals by using silicon micro-oscillators. We find an irreversibility line appearing well below the thermodynamic Bragg-glass melting line at a magnetic field which increases both with increasing the sample radius and with decreasing the temperature, paradoxically implying the existence of a reversible vortex solid. We show that at this irreversibility line, the sample radius can be identified with the crossover length between the Larkin and the random-manifold regimes of the vortex-lattice transverse roughness. Our method thus allows to determine, as a function of temperature and applied magnetic field, the minimum size of a vortex system that can be collectively pinned, or the so-called three-dimensional weak collective pinning Larkin radius, in a direct way.
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Publisher American Physical Society Place of Publication Editor
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Call Number BT @ hernan @ Serial 587
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Author Piriou, A.; Giannini, E.; Fasano, Y.; Senatore, C.; Fischer, O.
Title Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi2Sr2CuO6+d crystals Type Journal Article
Year 2010 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume (down) 81 Issue Pages 144517-144524
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Call Number BT @ yanina.fasano @ Serial 592
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Author Sereni, J.G.; Gómez Berisso, M.; Schmerber, G.; Kappler, J.P.
Title Suppression of the Shastry-Sutherland phase in Ce2 Pd 2 Sn at a field-induced critical point Type Journal Article
Year 2010 Publication Physical Review B – Condensed Matter and Materials Physics Abbreviated Journal Phys. Rev. B Condens. Matter Mater. Phys.
Volume (down) 81 Issue 18 Pages 184429
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Abstract The magnetic phase diagram of Ce2 Pd2 Sn is investigated through the field dependence of thermal, transport, and magnetic properties at low temperature. The upper transition, TM =4.8 K is slightly affected by magnetic field up to B=1 T whereas the lower one T C (B) rapidly increases from 2.1 K joining TM in a critical point at Tcr = (4.1±0.2) K for Bcr = (0.11±0.01) T. At that point, the intermediate phase, previously described as an unstable Shastry-Sutherland lattice, is suppressed. A detailed analysis around the critical point reveals a structure in the maximum of the ∂ M/∂ B (B) derivative, which may be related to a step in magnetization predicted by theory for the mentioned lattice. © 2010 The American Physical Society.
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ISSN 10980121 (ISSN) ISBN Medium
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Call Number BT @ berisso @ Serial 595
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Author M. Sirena, A. Zimmers, N. Haberkorn, E. E. Kaul, L. B. Steren, J. Lesueur, T. Wolf, Y. Le Gall, J.-J. Grob y G. Faini
Title nfluence of ion implantation on the magnetic and transport properties of manganite Films Type Journal Article
Year 2010 Publication Physical Review B (Condensed Matter and Materials Physics) Abbreviated Journal PRB
Volume (down) 81 Issue Pages 134439
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Call Number BT @ ekaul @ Serial 634
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Author Luzuriaga, J.
Title Mean free path in soccer and gases Type Journal Article
Year 2010 Publication European Journal of Physics Abbreviated Journal
Volume (down) 31 Issue 5 Pages 1071-1076
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Abstract The trajectories of the molecules in an ideal gas and of the ball in a soccer game are compared. The great difference between these motions and some similarities are discussed. This example could be suitable for discussing many concepts in kinetic theory in a way that can be pictured by students for getting a more intuitive understanding. It could be suitable for an introductory course in vacuum techniques or undergraduate courses in kinetic theory of gases. Without going into the slightly harder quantitative results, the analysis presented might be used for introducing some ideas of kinetic theory qualitatively to high school students. © 2010 IOP Publishing Ltd.
Address Centro Atómico Bariloche-CNEA, Instituto Balseiro, UNC, 8400, Bariloche, Argentina
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Notes Export Date: 9 August 2012; Source: Scopus Approved no
Call Number BT @ hernan @ Serial 649
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Author Alejandro, G.; Steren, L. B.; Pastoriza, H.; Vega, D.; Granada, M.; Rojas Sánchez, J. C.; Sirena, M.; Alascio, B.
Title Magnetoresistance effect in (La, Sr)MnO_3 bicrystalline films Type Journal Article
Year 2010 Publication Journal of Physics: Condensed Matter Abbreviated Journal
Volume (down) 22 Issue 34 Pages 346007
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Abstract The angular dependence of the magnetoresistance effect has been measured on bicrystalline La 0.75 Sr 0.25 MnO 3 films. The measurements have been performed on an electronically lithographed Wheatstone bridge. The study of the angular dependence of both the magnetoresistance and the resistance of single-crystalline and grain-boundary regions of the samples allowed us to isolate two contributions of low-field magnetoresistance in manganites. One of them is associated with the spin–orbit effect, i.e. the anisotropic magnetoresistance of ferromagnetic compounds, and the other one is related to spin-disorder regions at the grain boundary. Complementary x-ray diffraction, ferromagnetic resonance and low temperature magnetization experiments contribute to the characterization of the magnetic anisotropy of the samples and the general comprehension of the problem.
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ISSN 0953-8984 ISBN Medium
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Call Number BT @ hernan @ Serial 596
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Author Conte, V.; Giordano, J.L.; Zarate, J.J.; Luzuriaga, J.
Title Superconducting Devices for Radioastronomy; First Steps in Chile: SNS-junction Fabrication Type Conference Article
Year 2010 Publication Abbreviated Journal
Volume (down) 1 Issue Pages 424-427
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Abstract We present results of the microfabrication of Josephson Junctions (JJs) of Superconductor-Normal-superconductor (SNS) type, as a first step in the acquisition of the know-how of superconducting devices applied to radioastronomy. A twojunction SQUID was built using a Nb/Al bilayer deposited on a Si wafer. The procedure needs only one mask and a single UV exposure (i.e., one photolithography step). We show the micrograph and the observed non linear characteristic I-V curve at 4K of the first device fabricated in the framework of ALMA Grant 31090010.
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Area Expedition Conference Twenty-First International Symposium on Space Terahertz Technology
Notes Approved no
Call Number BT @ pedrazp @ Serial 736
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Author Gil, D.M.; Navarro, M.C.; Lagarrigue, M.C.; Guimpel, J.; Carbonio, R.E.; Gómez, M.I.
Title Synthesis and structural characterization of perovskite YFeO3 by thermal decomposition of a cyano complex precursor, Y[Fe(CN)6]·4H2O} Type Journal Article
Year 2010 Publication Journal of Thermal Analysis and Calorimetry Abbreviated Journal
Volume (down) Issue Pages 1-8
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Abstract The thermal decomposition of Y[Fe(CN)6]·4H2O has been studied in order to investigate the formation of the multi-ferroic oxide YFeO3. The starting material (Y[Fe(CN)6]·4H2O) and the decomposition products were characterized by IR spectroscopy, thermal analysis, X-ray powder diffraction (PXRD), and scanning electron microscopy. Metastable YFeO3 with hexagonal structure, space group P63/mmc, was obtained by thermal decomposition of Y[Fe(CN)6]·4H2O at 600 °C in air. Orthorhombic YFeO3 was obtained by the same method at T ≥ 800 °C in air. The crystal structure of orthorhombic YFeO3 was refined by Rietveld analysis using PXRD data. We found that it was slightly deficient in Y3+, which is in agreement with the small amount of Y2O3 found as impurity in the sample. The formula of the orthorhombic phase is Y0.986FeO3
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ISSN 13886150 ISBN Medium
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Notes Approved no
Call Number BT @ hernan @ Serial 601
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