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Author (up) Fasano, Y.; Seta, M.D.; Menghini, M.; Pastoriza, H.; Cruz, F. de la url  openurl
  Title Commensurability and stability in nonperiodic systems Type Journal Article
  Year 2005 Publication Proceedings of the National Academy of Sciences of the United States of America Abbreviated Journal  
  Volume 102 Issue Pages 3978  
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  Abstract We have investigated the response of 3D Bi$2$Sr$2$CaCu$8$ vortex structures to a weak perturbation induced by 2D Fe pinning structures acting on one extremity of vortex lines. The pinning patterns were nano-engineered at the sample surface by means of either a Bitter decoration of the vortex lattice or electron beam lithography. The commensurability conditions between 2D rigid pinning potentials and 3D elastic structures with short-range positional and long-range orientational correlation have been experimentally determined. When the 2D potential is a replica of the nonperiodic vortex structure an amplification of its interaction with the vortex structure takes place. This effect is detected only for the first matching field, becoming negligible for other matching fields. On the other hand, a periodic 2D perturbation is shown to transform the nonperiodic Bragg glass-like structure into an Abrikosov crystal with and effective Debye-Waller factor  
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  Call Number BT @ hernan @ fasano05b Serial 21  
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Author (up) Fasano, Y.; Seta, M.D.; Menghini, M.; Pastoriza, H.; Cruz, F. de la openurl 
  Title Symmetry transformation of the three-dimensional vortex system induced by two-dimensional square pinning potentials Type Journal Article
  Year 2004 Publication Physica C Abbreviated Journal  
  Volume 408-410 Issue Pages 520-521  
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  Abstract We report on symmetry changes of the bulk hexagonal vortex lattice induced by commensurate and incommensurate engineered 2D square pinning structures of Fe dots, deposited on one surface of Bi$2$Sr$2$CaCu$8$ single crystals.  
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  Call Number BT @ hernan @ fasano03b Serial 19  
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Author (up) Guimpel, J.; Pastoriza, H. openurl 
  Title Arquitectura a escala nanoscopica Type Journal Article
  Year 2004 Publication Ciencia Hoy Abbreviated Journal  
  Volume 14 Issue 84 Pages 39-44  
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  Notes Approved no  
  Call Number BT @ hernan @ guimpel04 Serial 22  
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Author (up) Herbsommer, J.A.; Correa, V.F.; Nieva, G.; Pastoriza, H.; Luzuriaga, J. doi  openurl
  Title 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  
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  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 (up) Kes, P.H.; Pastoriza, H.; Li, T.W.; Cubitt, R.; Forgan, E.M.; Lee, S.L.; Konczykowski, M.; Khaykovich, B.; Majer, D.; Fuchs, D.T.; Zeldov, E. url  openurl
  Title Flux lattice melting and dimensional crossover in Bi-2212 single crystals Type Journal Article
  Year 1996 Publication J. Phys. I France Abbreviated Journal  
  Volume 6 Issue Pages 2327-2354  
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  Abstract Flux lattice melting in (Bi-2212) single crystals has recently been studied by various techniques. In this contribution to the I. Schegolev Memorial Volume we review some experiments and compare their results. Muon-spin rotation and small angle neutron scattering (SANS) gave the first indications for an abrupt change of the flux lattice structure along a line in the B-T phase diagram. Experiments with Hall-sensor arrays proved that the flux line lattice experiences a first order phase transition (FOT) at this line. Measured as a function of field the resistance shows an abrupt kink at the FOT line and flux flow through narrow channels reveal a sudden drop of the shear modulus. Subsequent studies showed that the location of the FOT line in the phase diagram strongly depends on oxygen stoichiometry. For decreasing temperature the FOT line terminates at a critical point and continues into an almost field independent line which represents the location of a sharp peak in the magnetization (second peak). The second-peak line coincides with a crossover region in the low temperature range of the B-T diagram where both the muon spin rotation and SANS experiments reveal a transition from a lattice of flux lines to a lattice of pancake vortices. We compare our results with theoretical scenarios.  
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  Call Number BT @ hernan @ kes96 Serial 25  
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Author (up) Lerner, B.; Perez, M.S.; Bonaparte, J.; Rodriguez, D.J.; Pastoriza, H.; Boselli, A.; Lamagna, A. url  openurl
  Title Development Of Single Wall Carbon Nanotube Based Sensor Type Conference Article
  Year 2009 Publication OLFACTION AND ELECTRONIC NOSE: Proceedings of the 13th International Symposium on Olfaction and Electronic Nose Abbreviated Journal  
  Volume 1137 Issue 1 Pages 405-406  
  Keywords nanostructured materials; carbon nanotubes; gas sensors  
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  Call Number BT @ hernan @ lerner:405 Serial 526  
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Author (up) Marconi V. I.; Pastoriza, H.; Domínguez, D. doi  openurl
  Title Transverse voltage in disordered Josephson junction arrays with diagonal bias Type Journal Article
  Year 2004 Publication Journal of Low Temperature Physics Abbreviated Journal  
  Volume 135 Issue Pages 135-138  
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  Abstract We study numerically the effect of disorder in the transport properties of square Josephson junction arrays with a dc current applied in the diagonal direction ([11] direction). We obtain a finite transverse voltage in this case when we consider the presence of disorder in the critical currents of the junctions. We show that this behavior is in good agreement with previous experimental, results in square arrays with a diagonal current drive.  
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  Call Number BT @ hernan @ marconi04 Serial 27  
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Author (up) Marconi, V. I.; Candia, S.; Balenzuela, P.; Pastoriza, H.; Domínguez, D.; Martinoli, P. url  doi
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  Title Orientational pinning and transverse voltage: Simulations and experiments in square Josephson junction arrays Type Journal Article
  Year 2000 Publication Phys. Rev. B Abbreviated Journal  
  Volume 62 Issue 6 Pages 4096-4104  
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  Abstract We study the dependence of the transport properties of square Josephson Junctions arrays with the direction of the applied dc current, both experimentally and numerically. We present computational simulations of current-voltage curves at finite temperatures for a single vortex in an array of $L\times L$ junctions ($Ha^2/?_0=f=1/L^2$), and experimental measurements in $100\times1000$ arrays under a low magnetic field corresponding to $f\approx0.02$. We find that the transverse voltage vanishes only in the directions of maximum symmetry of the square lattice: the [10] and [01] direction (parallel bias) and the [11] direction (diagonal bias). For orientations different than the symmetry directions, we find a finite transverse voltage which depends strongly on the angle φ of the current. We find that vortex motion is pinned in the [10] direction ($?=0$), meaning that the voltage response is insensitive to small changes in the orientation of the current near $?=0$. We call this phenomenon orientational pinning. This leads to a finite transverse critical current for a bias at $?=0$ and to a transverse voltage for a bias at $?\not=0$. On the other hand, for diagonal bias in the [11] direction the behavior is highly unstable against small variations of φ, leading to a rapid change from zero transverse voltage to a large transverse voltage within a few degrees. This last behavior is in good agreement with our measurements in arrays with a quasi-diagonal current drive.  
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  Call Number BT @ hernan @ marconi00 Serial 26  
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Author (up) Martínez, E.D.; García Flores, A.F.; Pastoriza, H.; Urbano, R.R.; Rettori, C. url  openurl
  Title Electrothermal Silver Nanowire Thin Films for In-Situ Observation of Thermally-Driven Chemical Processes Type Journal Article
  Year 2017 Publication Sensors and Actuators B: Chemical Abbreviated Journal  
  Volume 259 Issue Pages 475–483  
  Keywords Silver nanowires; Nanocomposites; Electrothermal device; Transparent conductors; Gold nanoparticles; pNIPAM  
  Abstract We develop a novel device comprised of high optical transmittance thin films containing silver nanowires (AgNWs) in poly(methyl methacrylate) (PMMA) acting as heating elements. The electrothermal control of the AgNWs network allows us to externally trigger and tune the temperature conditions required to run chemical reactions and physicochemical processes. The device was successfully applied for the spectroscopic in-situ observation of three different model reactions: i) the thermal equilibrium of a CoCl2/HCl/H2O complex, ii) the reversible macromolecular phase transition of a pNIPAM solution, and iii) the nucleation and growth of gold nanoparticles (AuNPs). In the first case, the color of the Co2+ complex was reversibly switched from pink to blue when changing the thermal equilibrium condition. In the second one, the optical transmittance of an aqueous solution of carboxylic-terminated pNIPAM polymer was cycled from high to low as the temperature of the solution was below or above the lower critical solubility temperature (LCST) respectively. Finally, the electrothermal control on the device was applied to the study of the nucleation and growth of AuNPs in an organic solution of AuCl3 containing oleylamine acting as both the reducer and the stabilizing agent. The versatility of the electrothermal device provides an easy way to undertake thermally controlled processes and develop optical elements such as smart windows and lab-on-a-chip devices. The AgNWs-PMMA nanocomposite was also applied successfully as an electrothermal ink on the external side walls of a test tube.  
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  ISSN 0925-4005 ISBN Medium  
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  Call Number BT @ hernan @ Serial 764  
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Author (up) Martinez, E.D.; Lohr, J.H.; Sirena, M.; Sanchez, R.D.; Pastoriza, H. url  doi
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  Title Silver nanowires in poly(methyl methacrylate) as a conductive nanocomposite for microfabrication Type Journal Article
  Year 2016 Publication Flexible and Printed Electronics Abbreviated Journal  
  Volume 1 Issue 3 Pages 035003  
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  Abstract A novel nanocomposite resist is presented based on AgNWs dispersed in poly(methyl methacrylate). It is shown that this nanocomposite resist displays sheet resistances below 10 Ω sq −1 for concentrations of AgNWs higher than ##IMG## [http://ej.iop.org/images/2058-8585/1/3/035003/fpeaa3d4dieqn1.gif] {$4 \% {\rm{wt}}$} and can be used for a wide range of microfabrication techniques. The resist can act as a conductive ink that cures at room temperature, form thin films with low sheet resistances, and be used in fast replication methods derived from soft lithography. Furthermore, it can be applied for nano-scale fabrication via electron beam lithography (EBL) on different substrates, including flexible and insulating materials, providing a straightforward method to avoid charging effects. This, being the first report about a nanocomposite resist based on AgNWs for EBL, describes a simple procedure to account for suspended nanowires, forming bridges, nanocantilevers and more complex nanostructures. A wide range of opportunities opens for the single-step fabrication of electronic components in the nano and micro scale.  
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  ISSN 2058-8585 ISBN Medium  
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  Notes Approved no  
  Call Number BT @ hernan @ Serial 733  
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