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Author Haberkorn, N.; Bengio, S.; Suárez, S.; Pérez, P.D.; Hofer, J.A.; Sirena, M. url  openurl
  Title Effect of thermal annealing and irradiation damage on the superconducting critical temperature of nanocrystalline γ-Mo2N thin films Type Journal Article
  Year 2019 Publication Materials Letters Abbreviated Journal  
  Volume 236 Issue Pages (down) 252-255  
  Keywords Nitrides; Sputtering; Superconductivity; Irradiation  
  Abstract We report on the influence of the disorder and stoichiometry in the resulting superconducting critical temperature of γ-Mo2N thin films. Initially, three films (with Tc values of 7.6 K, 6.8 K and 6 K) were grown at room temperature by reactive sputtering, on Si (1 0 0) using different N2/(Ar+N2) mixtures. The influence of the thermal annealing up to 973 K and irradiation damage produced by 1 MeV Zr+(fluence up 2 × 1014 cm−2) is analyzed. The Tc of pristine films remains unchanged for increasing irradiation doses up 2 × 1014 cm−2. The Tc for annealed films decreases close to the value expected for bulk samples (≈5 K) for increasing the annealing temperature. Successive irradiations of the annealed films tend to increase their Tc up to its initial values (before annealing). The results indicate that the Tc in nanometric grain size γ-Mo2N thin films is affected by both nitrogen stoichiometry and disorder at the atomic scale.  
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  ISSN 0167-577x ISBN Medium  
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  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 850  
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Author Haberkorn, N.; Bridoux, G.; Osquiguil, E.; Nieva, G.; Guimpel, J. url  openurl
  Title Hall effect in a GdBa2Cu3O7-?/La0.75 Sr0.25MnO3 perovskite bilayer Type Journal Article
  Year 2007 Publication Applied Surface Science Abbreviated Journal Appl. Surf. Sci.  
  Volume 254 Issue 1 SPEC. ISS. Pages (down) 222-224  
  Keywords Hall effect; Perovskite Bilayer; Barium compounds; Ferromagnetic materials; Films; Hall effect; Magnetic fields; Magnetron sputtering; Manganites; Perovskite; Strontium compounds; Superconducting devices; Dc magnetron sputtering; Electric transport; Hall resistivity regimes; Oxygen doping; Gadolinium compounds  
  Abstract We present results on the Hall coefficient RH in the normal state for a GdBa2Cu3O7-?/La0.75 Sr0.25MnO3 bilayer and a La0.75Sr0.25MnO3 film grown by dc magnetron sputtering on (1 0 0) SrTiO3. We find that the electric transport on the bilayer can be qualitatively described using a simple parallel layers model. The GdBa2Cu3O7-? layer presents a carrier density approximately equal to that reported for 7 – ? = 6.85 oxygen doping. Also we observe an unexpected presence of two Hall resistivity regimes, effects that may be associated with the internal magnetic field induced on the superconducting layer by the ferromagnetic layer.  
  Address Instituto Balseiro, Universidad Nacional de Cuyo, Comisi  
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  ISSN 01694332 (ISSN) ISBN Medium  
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  Notes Export Date: 17 April 2009; Source: Scopus; CODEN: ASUSE; doi: 10.1016/j.apsusc.2007.07.041; Language of Original Document: English; Correspondence Address: Haberkorn, N.; Comisi Approved no  
  Call Number BT @ osquigui @ Serial 363  
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Author Morán, M.J.; Condó, A.M.; Soldera, F.; Sirena, M.; Haberkorn, N. openurl 
  Title Martensitic transformation in freestanding and supported Cu–Al–Ni thin films obtained at low deposition temperatures Type Journal Article
  Year 2016 Publication Materials Letters Abbreviated Journal  
  Volume 184 Issue Pages (down) 177  
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  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 749  
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Author Pozo-López, G.; Condó, A.M.; Fabietti, L.M.; Winkler, E.; Haberkorn, N.; Urreta, S.E. url  doi
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  Title Microstructure of as-cast single and twin roller melt-spun Ni2MnGa ribbons Type Journal Article
  Year 2017 Publication Materials Characterization Abbreviated Journal  
  Volume 124 Issue Pages (down) 171-181  
  Keywords Shape–memory alloys; Magnetic properties; Martensitic transformation; Rapid solidification; Microstructure; Transmission electron microscopy  
  Abstract Stoichiometric Ni2MnGa alloys are processed by two rapid solidification techniques – single-roller (SR) and twin-roller (TR) melt spinning – and the resulting microstructures and magnetic properties determined. Samples processed at tangential wheel speeds of 10m/s (V10) and 15m/s (V15) are studied in the as-cast condition to analyze the influence of the production methods on the microstructure. Important aspects like the resulting phases, their crystallographic texture, magnetic properties, martensitic transformation temperatures and Curie temperatures are compared. In addition, the magnetization mechanism involving twin boundary motion is explored. Our results indicate that the TR method provides lower cooling rates, thicker samples, higher internal stresses and larger MnS precipitates. However, the quenching rate is mainly determined by the tangential wheel velocity. TR samples also exhibit [100] texture normal to the ribbon plane but in a lesser extent than SR ribbons. Martensitic transformation temperatures are higher in samples V15 (~150K) than in V10 (~100K), with no clear difference between the SR and TR modes. This behavior is explained by considering distinct degrees of disorder in the L21 austenite phase resulting from quenching. The hysteresis of the transformation, defined as the difference Af−MS, takes similar values in the four samples analyzed. Pre-martensitic transformation temperatures are also slightly higher in samples V15, (230±3) K, than in samples V10, (222±3) K, as the magnitude of the Hopkinson effect, in good agreement with a higher residual stress level in TR ribbons. In the martensitic state, all ribbons exhibit hysteresis loops characteristic of a magnetization mechanism involving twin boundary motion. The switching magnetic fields for the onset of Type I twin boundary motion result between 220mT and 365mT, values equivalent to twinning stresses of about 1MPa. It is concluded that both procedures, SR and TR melt spinning, provide microstructures favoring magnetic field induced twin variant reorientation.  
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  ISSN 1044-5803 ISBN Medium  
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  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 779  
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Author Domenichini, P., Condó, A. M., Haberkorn, N. openurl 
  Title Structural characterization of FeePd nanowires grown by electrodeposition using an acid electrolyte Type Journal Article
  Year 2016 Publication Materials Chemistry and Physics Abbreviated Journal  
  Volume 177 Issue Pages (down) 164-170  
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  Call Number BT @ pedrazp @ Serial 746  
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Author Kaul, E.E.; Haberkorn, N.; Guimpel, J. openurl 
  Title Crystalline orientation of BiMnO3 thin films grown by rf-sputtering Type Journal Article
  Year 2007 Publication Applied Surface Science Abbreviated Journal Appl. Surf. Sci.  
  Volume 254 Issue 1 Pages (down) 160-163  
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  Abstract BiMnO3 thin films were deposited by means of rf-sputtering onto [1 0 0] oriented SrTiO3 substrates. X-ray diffraction measurements revealed epitaxial growth with [0 0 1](m) orientation in the monoclinic structure representation, equivalent to the [1 1 1](pc) direction of the pseudocubic cationic lattice. This [0 0 1](m) orientation was obtained in a wide deposition parameters range. Preliminary magnetization measurements suggest that these films do not present ferromagnetism below the bulk Curie temperature, T-c = 105 K. (C) 2007 Elsevier B.V. All rights reserved.  
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  ISSN 0169-4332 ISBN Medium  
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  Notes ISI:000250800100037 Approved no  
  Call Number BT @ hernan @ Serial 147  
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Author Guimpel, J.; Haberkorn, N.; Sirena, M.; Steren, L.B.; Saldarriaga, W.; Baca, E.; Gomez, M.E. openurl 
  Title Interface effects in perovskite superlattices Type Journal Article
  Year 2004 Publication JOURNAL OF LOW TEMPERATURE PHYSICS Abbreviated Journal  
  Volume 135 Issue 1-2 Pages (down) 115-118  
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  Abstract The effect of interface disorder in perovskite superlattices, either with the substrate or between layers dominates the physics of the material, even when the lattice parameter of the component materials differs in less than 1%. Unexpected behavior emerges, like exchange bias in a system where no antiferromagnetic material has been included in the superlattice design.  
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  ISSN 0022-2291 ISBN Medium  
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  Notes ISI:000189139000012 Approved no  
  Call Number BT @ hernan @ Serial 166  
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Author Haberkorn, N.; Troiani, H.; Condó, A.M.; Wang, H.; Mao, Q.; Fang, M. openurl 
  Title Vortex dynamics in phase separated Tl0.58Rb0.42Fe1.72Se2 crystals Type Journal Article
  Year 2016 Publication Solid State Communications Abbreviated Journal  
  Volume 247 Issue Pages (down) 88  
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  Call Number BT @ pedrazp @ Serial 751  
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Author Kim, J.; Haberkorn, N.; Nazaretski, E.; Paula, R. de; Tan, T.; Xi, X.X.; Tajima, T.; Movshovich, R.; Civale, L. url  openurl
  Title Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film Type Journal Article
  Year 2015 Publication Solid State Communications Abbreviated Journal Solid State Commun.  
  Volume 204 Issue Pages (down) 56-60  
  Keywords A. Superconducting materials; B. Films; C. Magnetic penetration depth; D. Vortex pinning  
  Abstract We report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB2 thin film. The small magnetic penetration depth of λ=50±10 nm at T=4 K is related to a clean Ï€-band. We find a high self-field critical current density Jc, which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the Ï€-band. The temperature dependence of the creep rate S (T) at low magnetic field can be explained by a simple Anderson–Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field.  
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  ISSN 0038-1098 ISBN Medium  
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  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 729  
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Author Haberkorn, N.; Bengio, S.; Troiani, H.; Suárez, S.; Pérez, P.D.; Granell, P.; Golmar, F.; Sirena, M.; Guimpel, J. url  openurl
  Title Thickness dependence of the superconducting properties of γ- Mo<inf>2</inf>N thin films on Si (001) grown by DC sputtering at room temperature Type Journal Article
  Year 2018 Publication Materials Chemistry and Physics Abbreviated Journal Mater. Chem. Phys  
  Volume 204 Issue Pages (down) 48-57  
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  Notes Cited By :1; Export Date: 14 March 2018 Approved no  
  Call Number BT @ jguimpel @ Serial 785  
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