toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author Gonzalez Sutter, J.; Neñer, L.; Navarro, H.; Leyva, G.; Fusil, S.; Bouzehouane, K.; Haberkorn, N.; Sirena, M. url  doi
openurl 
  Title Oxygen influence in the magnetic and the transport properties of ferroelectric/ferromagnetic heterostructures Type Journal Article
  Year 2017 Publication Thin Solid Films Abbreviated Journal  
  Volume 639 Issue Pages (down) 42-46  
  Keywords Cafm; Ultra-thin oxides; Multiferroic nanostructures  
  Abstract Oxygen vacancies in oxides nanostructures are the origin of many intriguing phenomena. We have studied the influence of the oxygen pressure in the tunneling properties of a ferroelectric barrier, Ba0.25Sr0.75TiO3 (BSTO), grown over a ferromagnetic electrode. A phenomenological model description was used to obtain critical information about the structure and electrical properties of ultra-thin BSTO layers using conductive atomic force microscopy. The BSTO layers present good insulation properties. Reducing the oxygen content increases the conductivity of the samples. The tunneling of the current carriers is probably the main conduction mechanism for samples with higher barrier thicknesses.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0040-6090 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 774  
Permanent link to this record
 

 
Author Haberkorn, N.; Eomb, M.J.; You, J.S.; Kim, J.; Kim, J.S. openurl 
  Title Critical current densities and flux creep rates in near optimally doped BaFe2- xRuxAs2 (x=0.7) single crystals Type Journal Article
  Year 2016 Publication Solid State Communications Abbreviated Journal  
  Volume 231-232 Issue Pages (down) 26-30  
  Keywords  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 747  
Permanent link to this record
 

 
Author Navarro, H.; Sirena, M.; Kim, J.; Haberkorn, N. url  doi
openurl 
  Title Smooth surfaces in very thin GdBa2Cu3O7−δ films for application in superconducting tunnel junctions Type Journal Article
  Year 2015 Publication Physica C: Superconductivity and its Applications Abbreviated Journal Physica C  
  Volume 510 Issue Pages (down) 21-26  
  Keywords Thin films; Superconductivity; Morphology  
  Abstract Abstract

This paper provides a systematic analysis of the morphology and the superconducting critical temperature obtained in very thin GdBa2Cu3O7−δ films grown on (0 0 1) SrTiO3 substrates by DC sputtering. We find that the use of a very thin SrTiO3 buffer layer (≈2 nm) modify the nucleation of GdBa2Cu3O7−δ on the surface of the substrate reducing the formation of 3 dimensional clusters. Our results demonstrate that 16 nm thick GdBa2Cu3O7−δ films with an average root-mean-square (RMS) smaller than 1 nm and large surface areas (up 10 μm2) free of 3 dimensional topological defects can be obtained. In films thinner than 24 nm the onset (zero resistance) of superconducting transition of the films is reduced, being close to liquid nitrogen. This fact can be associated with stress reducing the orthorhombicity and slightly drop in oxygen stoichiometry.
 
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0921-4534 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 726  
Permanent link to this record
 

 
Author Kim, J.; Haberkorn, N.; Gofryk, K.; Graf, M.J.; Ronning, F.; Sefat, A.S.; Movshovich, R.; Civale, L. url  openurl
  Title Superconducting properties in heavily overdoped Ba(Fe0.86Co0.14)2As2 single crystals Type Journal Article
  Year 2015 Publication Solid State Communications Abbreviated Journal Solid State Commun.  
  Volume 201 Issue Pages (down) 20-24  
  Keywords A. Iron arsenide superconductors; B. Upper critical field; C. Magnetic penetration depth; D. Vortex pinning  
  Abstract Abstract

We report the intrinsic superconducting parameters in a heavily overdoped Ba(Fe1−xCox)2As2 (x=0.14) single crystal and their influence in the resulting vortex dynamics. We find a bulk superconducting critical temperature of 9.8 K, magnetic penetration depth λab (0)=660±50 nm, coherence length ξab (0)=6.4±0.2 nm, and the upper critical field anisotropy γT→Tc≈3.7. The vortex phase diagram, in comparison with the optimally doped compound, presents a narrow collective creep regime. The intrinsic pinning energy plays an important role in the resulting vortex dynamics as compared with similar pinning landscape and comparable intrinsic thermal fluctuations.
 
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0038-1098 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 724  
Permanent link to this record
 

 
Author Ale Crivillero, M.V.; Haberkorn, N.; Nieva, G.; Guimpel, J. url  openurl
  Title Electrical transport properties of FeSe/Fe3O4 bilayers 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 (down) 18-21  
  Keywords FeSe thin films; Magnetite thin films; Superconductivity  
  Abstract In this work, we study the electronic properties of FeSe/Fe3O4 bilayers deposited onto SrTiO3 (100) and MgO (100) substrates by DC magnetron sputtering. The comparative study of Fe3O4 films grown on SrTiO3 and MgO reveals significant differences in the intensity of the Verwey transition (Tv∼130K). This allows us to probe the impact of the distortions associated to the Verwey transition on the transport properties of the FeSe over-layer in the FeSe/Fe3O4 bilayers. A correlated increase in the resistance and weakened superconducting properties are observed..  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2214-7853 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 846  
Permanent link to this record
 

 
Author Haberkorn, N.; Bengio, S.; Suárez, S.; Pérez, P.D.; Sirena, M.; Guimpel, J. url  openurl
  Title Effect of the nitrogen-argon gas mixtures on the superconductivity properties of reactively sputtered molybdenum nitride thin films Type Journal Article
  Year 2018 Publication Materials Letters Abbreviated Journal Materials Letters  
  Volume 215 Issue Pages (down) 15-18  
  Keywords  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Cited By :1; Export Date: 14 March 2018 Approved no  
  Call Number BT @ jguimpel @ Serial 783  
Permanent link to this record
 

 
Author Haberkorn, N.; Suárez, S.; Pérez, P.D.; Troiani, H.; Granell, P.; Golmar, F.; Lee, J.-H.; Moon, S.H. url  doi
openurl 
  Title Effect of mixed pinning landscapes produced by 6 MeV oxygen irradiation on the resulting critical current densities Jc in 1.3 µm thick GdBa2Cu3O7-d coated conductors grown by co-evaporation Type Journal Article
  Year 2017 Publication Physica C: Superconductivity and its Applications Abbreviated Journal Physica C  
  Volume 542 Issue Pages (down) 6-11  
  Keywords Coated conductors; Vortex dynamics; Glassy exponents; Irradiation  
  Abstract We report the influence of crystalline defects introduced by 6 MeV 16O3+ irradiation on the critical current densities Jc and flux creep rates in 1.3 µm thick GdBa2Cu3O7-δ coated conductor produced by co-evaporation. Pristine films with pinning produced mainly by random nanoparticles with diameter close to 50 nm were irradiated with doses between 2 × 1013 cm−2 and 4 × 1014 cm−2. The irradiations were performed with the ion beam perpendicular to the surface of the samples. The Jc and the flux creep rates were analyzed for two magnetic field configurations: magnetic field applied parallel (Hâ•‘c) and at 45° (Hâ•‘45°) to the c-axis. The results show that at temperatures below 40 K the in-field Jc dependences can be significantly improved by irradiation. For doses of 1 × 1014 cm−2 the Jc values at μ0H = 5 T are doubled without affecting significantly the Jc at small fields. Analyzing the flux creep rates as function of the temperature in both magnetic field configurations, it can be observed that the irradiation suppresses the peak associated with double-kink relaxation and increases the flux creep rates at intermediate and high temperatures. Under 0.5 T, the flux relaxation for H‖c and H||45° in pristine films presents characteristic glassy exponents μ = 1.63 and μ = 1.45, respectively. For samples irradiated with 1 × 1014 cm−2, these values drop to μ = 1.45 and μ = 1.24, respectively  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0921-4534 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 771  
Permanent link to this record
 

 
Author Haberkorn, N.; Lovey, F. C.; Condó, A. M.; Guimpel, J doi  openurl
  Title Development and characterization of shape memory Cu-Zn-Al thin films Type Journal Article
  Year 2010 Publication Materials Science and Engineering B: Solid-State Materials for Advanced Technology Abbreviated Journal  
  Volume 170 Issue 1-3 Pages (down) 5-8  
  Keywords  
  Abstract Ternary Cu-Zn-Al alloys show good shape memory properties with narrow hysteresis and a wide range of martensitic transformation temperature (Ms), depending on the alloy composition. Thin films of Cu-Zn-Al with shape memory effect were grown for the first time using a new procedure. First Cu-Al thin films were obtained by DC sputtering on Si (1 0 0) substrates at room temperature, and second, the Cu-Al films were encapsulated and annealed in the presence of a Cu-Zn-Al bulk reference in order to fix a Zn vapour pressure. In this way a controlled amount of Zn is transported from the bulk reference into the film, in such a way that the Ms of the film becomes nearly the same as the bulk reference. The structures and microstructures of the as grown films were analysed by X-ray diffraction and transmission electron microscopy. The martensitic transformation temperature was determined by resistivity measurements.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ Serial 603  
Permanent link to this record
 

 
Author Sirena, M.; Haberkorn, N.; Granada, M.; Steren, L.B.; Guimpel, J. openurl 
  Title Metal-insulator transition induced by postdeposition annealing in low doped manganite films Type Journal Article
  Year 2009 Publication JOURNAL OF APPLIED PHYSICS Abbreviated Journal  
  Volume 105 Issue 3 Pages (down)  
  Keywords  
  Abstract We studied the transport and magnetic properties of low-doped manganite films after different oxygenation processes. The oxygen content was adjusted by postdeposition annealing at different oxygen pressures and annealing times. For all the samples we observed an increase in the Curie temperature and the remnant magnetization with the oxygen content. In general, for decreasing number of oxygen vacancies, samples under expansive strain become more homogeneous and their electrical resistivity decreases. A metal-insulator transition is induced in highly oxygenated films grown on SrTiO3, probably related to a shift of the mobility edge crossing below the Fermi energy. We found that the oxygenation dynamics depend critically on the strain field induced by the substrates and also on the Sr doping concentration.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0021-8979 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000263409700057 Approved no  
  Call Number BT @ hernan @ Serial 143  
Permanent link to this record
 

 
Author Haberkorn, N.; Guimpel, J. openurl 
  Title Tuning of the metal-insulator transition in La0.75Sr0.25MnO3/PrBa2Cu3O7-delta superlattices Type Journal Article
  Year 2005 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 87 Issue 4 Pages (down)  
  Keywords  
  Abstract We have investigated the magnetotransport and magnetic properties of La0.75Sr0.25MnO3/PrBa2Cu3O7-delta superlattices. Magnetic hysteresis loops show the expected ferromagnetic behavior, although the saturation magnetization is smaller than the expected value based on nominal layer thickness. We find that the electric transport on the superlattices can be qualitatively described using a simple layers-in-parallel model. We also find that the temperature at which the peak of the resistivity curve is located, and in consequence the temperature at which the maximum of the magnetoresistance curve are observed, are a function of layer thickness. The superlattices show an appreciable magnetoresistance for low temperatures, which may be consequence of a spin canted or weak antiferromagnetic manganite phase stabilized at the interfaces. (c) 2005 American Institute of Physics.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0003-6951 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000230725900043 Approved no  
  Call Number BT @ hernan @ Serial 157  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: