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Author Hofer J. A., Haberkorn N.
Title Superconductivity in nanocrystalline tungsten thin films growth by sputtering in a nitrogen-argon mixture Type Journal Article
Year 2019 Publication Thin Solid Films Abbreviated Journal
Volume 685 Issue Pages 117-122
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Notes Approved yes
Call Number BT @ nhaberk @ Serial 816
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Author Hofer, J.A.; Haberkorn, N.
Title Flux flow velocity instability and quasiparticle relaxation time in nanocrystalline β-W thin films Type Journal Article
Year 2021 Publication Thin Solid Films Abbreviated Journal Thin Solid Films
Volume 730 Issue Pages 138690
Keywords Thin films; Electrical transport; Vortex velocities
Abstract We characterized the superconducting properties of a micropatterned 23 nm thick β-W film using electrical transport measurements in magnetic fields. The film is nanocrystalline and displays a smooth surface. The superconducting critical temperature is 4.6 K. The critical current densities display a fast drop with the magnetic field, indicating weak vortex pinning. From the analysis of the instability in the vortex motion at low magnetic fields in the flux-flow state, we observe vortex velocities up 800 m/s. An inelastic lifetime of quasiparticles around 0.6 ns is estimated at low temperatures. Together with high uniformity in thickness and simplicity in the fabrication process, the superconducting properties make β-W films promising for applications in fast single-photon detectors.
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ISSN 0040-6090 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 870
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Author Gonzalez Sutter, J.; Neñer, L.; Navarro, H.; Leyva, G.; Fusil, S.; Bouzehouane, K.; Haberkorn, N.; Sirena, M.
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 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.
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Notes Approved no
Call Number BT @ pedrazp @ Serial 774
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Author N. Haberkorn, S. Bengio, H. Troiani, S. Suárez, P. D. Pérez, M. Sirena, J. Guimpel.
Title Synthesis of nanocrystalline delta-MoN by thermal annealing of amorphous thins films grown on (100) Si by reactive DC sputtering at room temperature Type Journal Article
Year 2018 Publication Thin Solid Films Abbreviated Journal Thin Solid Films
Volume 660 Issue Pages 242-246
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Call Number BT @ nhaberk @ Serial 797
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Author Sirena, M.; Steren, L.; Guimpel, J.
Title Thickness dependence of the properties of La0.6Sr0.4MnO3 thin films Type Journal Article
Year 2000 Publication Thin Solid Films Abbreviated Journal
Volume 373 Issue 1-2 Pages 102-106
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Abstract We have studied the thickness dependence of the transport and magnetic properties of strongly textured La0.6Sr0.4MnO3 thin films grown on MgO and SrTiO3, for thickness between 5 and 500 nm. While the resistivity and the magnetoresistance are strongly affected, the magnetization is only moderately changed. The effect on the metal-insulator transition, the low field magnetoresistance and carrier localization is dependent on the substrate, evidencing the effect of the induced defects and strains. (C) 2000 Elsevier Science S.A. All rights reserved.
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ISSN 0040-6090 ISBN Medium
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Notes ISI:000090045900024 Approved no
Call Number BT @ hernan @ Serial 176
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