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Author Romero, M.A.; Aligia, A.A.; Sereni, J.G.; Nieva, G.
Title Interpretation of experimental results on Kondo systems with crystal field Type Journal Article
Year 2014 Publication Journal of Physics: Condensed Matter Abbreviated Journal J. Phys. : Condens. Matter
Volume 26 Issue Pages 025602
Keywords cond-mat.str-el
Abstract We present a simple approach to calculate the thermodynamic properties of single Kondo impurities including orbital degeneracy and crystal field effects (CFE) by extending a previous proposal by K. D. Schotte and U. Schotte [Physics Lett. A 55, 38 (1975)]. Comparison with exact solutions for the specific heat of a quartet ground state split into two doublets shows deviations below $10\%$ in absence of CFE and a quantitative agreement for moderate or large CFE. As an application, we fit the measured specific heat of the compounds CeCu$2$Ge$2$, CePd${3}$Si${0.3}$, CePdAl, CePt, Yb$2$Pd$2$Sn and YbCo$2$Zn${20}$. The agreement between theory and experiment is very good or excellent depending on the compound, except at very low temperatures due to the presence of magnetic correlations (not accounted in the model).
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Notes arXiv:1308.3256v3; Journal Ref: J. Phys.: Condens. Matter 26 (2014) 025602 (9pp) Approved no
Call Number (up) BT @ berisso @ Serial 675
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Author Sereni, J.G.; Gomez Berisso, M.; Betancourth, D.; Correa, V.F.; Canales, N.C.; Geibel, C.
Title Evidence for a dimensionality crossover at the disappearance of magnetism in the Kondo lattice alloy CeCo1-xFexSi Type Journal Article
Year 2014 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 89 Issue 3 Pages 035107
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Publisher American Physical Society Place of Publication Editor
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Call Number (up) BT @ berisso @ 10.1103/PhysRevB.89.035107 Serial 677
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Author Imboden, M.; Han, H.; Stark, T.; Lowell, E.; Chang, J.; Pardo, F.; Bolle, C.; del Corro, P.G.; Bishop, D.J.
Title Building a Fab on a Chip Type Journal Article
Year 2014 Publication Nanoscale Abbreviated Journal
Volume 6 Issue Pages 5049-5062
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Abstract Semiconductor fabs are large, complex industrial sites with costs for a single facility approaching $10B. In this paper we discuss the possibility of putting the entire functionality of such a fab onto a single silicon chip. We demonstrate a path forward where, for certain applications, especially at the nanometer scale, one can consider using a single chip approach for building devices with significant potential cost savings. In our approach, we build micro versions of the macro machines one typically finds in a fab, and integrating all the components together. We argue that the technology now exists to allow one to build a Fab on a Chip.
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Publisher The Royal Society of Chemistry Place of Publication Editor
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ISSN 2040-3364 ISBN Medium
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Notes Approved no
Call Number (up) BT @ hernan @ Serial 679
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Author R. H. Rodriguez, L. Tosi, M. Menghini, H. Pastoriza and C. A. Balseiro
Title Multiple First Order Transitions in Cr Thin Films Type Journal Article
Year 2014 Publication Journal of Physics: Conference Series Abbreviated Journal
Volume 568 Issue 4 Pages 042031
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Abstract The incommensurate spin density wave (SDW) in metalic Cr forms below T N = 311K and is characterized by a temperature dependent wave-vector Q along the direction. The wavelength varies from 78 Ã… at 300 K to 60 Ã… at 150 K. In thin films, the Q-vector orients perpendicular to the film surface and the SDW is forced to satisfy boundary conditions. As a consequence of the confinement, the SDW wavelength is quantized in a set of available modes, each one having n nodes. As the temperature decreases the wavelength does not follow a continuous bulk-type variation but jumps between different allowed values. These jumps occur at certain determined temperatures T n as first order type transitions which are accompanied with a decrease ( n to n + 1 nodes) or an increase ( n + 1 to n nodes) of the resistance. In this work, we present transport measurements on Cr thin films showing hysteretic behavior in the resistance as a function of temperature in cooling-warming cycles. The hysteresis loops are thickness dependent and present structures which we associate with the possible multiple transitions that may occur as temperature is swept.
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ISSN 1742-6596 ISBN Medium
Area Expedition Conference Low Temperature Physics XXVII
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Call Number (up) BT @ hernan @ Serial 702
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Author D. Perez-Morelo and H. Pastoriza
Title Torque magnetometry in YBa 2 Cu 3 O 7-δ single crystals using high sensitive micromechanical torsional oscillator Type Journal Article
Year 2014 Publication Journal of Physics: Conference Series Abbreviated Journal
Volume 568 Issue 2 Pages 022038
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Abstract We have developed a high-sensitive micro-torsional oscillators and fabricated with a standard silicon process, as a platform to study the low temperatures magnetic properties of micron sized samples. When the oscillator-sample system interacts with a magnetic field, the displacement of the oscillator from its equilibrium position can be detected as a small change in the capacitance (≈ 0.001 pF). We use this device to study the magnetic response of a thick twinned YBa 2 Cu 3 O 7− δ disk when the magnetic field is tilted away from the c axis in the temperature range 80 K < T < 100 K (T c ≈ 92K).
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ISSN 1742-6596 ISBN Medium
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Notes Approved no
Call Number (up) BT @ hernan @ Serial 703
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Author M. I. Dolz,Y Fasano, N. R. Cejas Bolecek, H. Pastoriza, M. Konczykowski and C. J. van der Beek
Title Detection of discretized single-shell penetration in mesoscopic vortex matter Type Journal Article
Year 2014 Publication Journal of Physics: Conference Series Abbreviated Journal
Volume 568 Issue 2 Pages 022010
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Abstract We investigated configurational changes in mesoscopic vortex matter with less than thousand vortices during flux penetration in freestanding 50 μm diameter disks of Bi 2 Sr 2 CaCu 2 O 8+δ . High-resolution AC and DC local magnetometry data reveal oscillations in the transmittivity echoed in peaks in the third-harmonics magnetic signal fainting on increasing vortex density. By means of extra experimental evidence and a simple geometrical analysis we show that these features fingerprint the discretized entrance of single-shells of vortices having a shape that mimics the sample edge.
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ISSN 1742-6596 ISBN Medium
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Notes Approved no
Call Number (up) BT @ hernan @ Serial 704
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Author Cecilia Blanco, M.; De Paoli, J.M.; Ceppi, S.; Tirao, G.; Nassif, V.M.; Guimpel, J.; Carbonio, R.E.
Title Synthesis, structural characterization and magnetic properties of the monoclinic ordered double perovskites BaLaMSbO6, with M = Mn, Co and Ni Type Journal Article
Year 2014 Publication Journal of Alloys and Compounds Abbreviated Journal
Volume 606 Issue Pages 139-148
Keywords Double perovskites; Magnetic properties; X-ray emission spectroscopy; Neutron powder diffraction
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ISSN 0925-8388 ISBN Medium
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Notes Approved no
Call Number (up) BT @ jguimpel @ Serial 681
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Author Haberkorn, N.; Condó, A.M.; Espinoza, C.; Jaureguizahar, S.; Guimpel, J.; Lovey, F.C.
Title Bulk-like behavior in the temperature driven martensitic transformation of Cu-Zn-Al thin films with 2H structure Type Journal Article
Year 2014 Publication Materials Letters Abbreviated Journal Journal of Alloys and Compounds
Volume 591 Issue Pages 263-267
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Notes Cited By :3; Export Date: 14 March 2018 Approved no
Call Number (up) BT @ jguimpel @ Serial 789
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Author Amigó, M.L.; Crivillero, V.A.; Franco, D.G.; Badía-Majós, A.; Guimpel, J.; Nieva, G.
Title Vortex pinning by intrinsic correlated defects in Fe<inf>1-y</inf>Se Type Journal Article
Year 2014 Publication Journal of Physics: Conference Series Abbreviated Journal J. Phys.: Conf. Ser.
Volume 507 Issue Part 1 Pages
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Notes Cited By :1; Export Date: 14 March 2018 Approved no
Call Number (up) BT @ jguimpel @ Serial 790
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Author Espinoza Torres, C.; Condó, A.M.; Haberkorn, N.; Zelaya, E.; Schryvers, D.; Guimpel, J.; Lovey, F.C.
Title Structures in textured Cu-Al-Ni shape memory thin films grown by sputtering Type Journal Article
Year 2014 Publication Materials Letters Abbreviated Journal Materials Characterization
Volume 96 Issue Pages 256-262
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Notes Cited By :5; Export Date: 14 March 2018 Approved no
Call Number (up) BT @ jguimpel @ Serial 791
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