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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 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 Núñez Regueiro, M.; Esquinazi, P.; Izbizky, M.A.; Durán, C.; Castello, D.; Luzuriaga, J. doi  openurl
  Title Tunneling systems in high temperature superconductors Type Journal Article
  Year 1988 Publication Annales de Physique Abbreviated Journal Ann. Phys. Fr.  
  Volume 13 Issue 5 Pages 401-406  
  Keywords acoustic wave absorption; acoustic wave velocity; barium compounds; high temperature superconductors; lanthanum compounds; rare earth compounds; strontium compounds; superconductive tunnelling; thermal conductivity of solids; tunnelling systems; high temperature superconductors; thermal conductivity; sound attenuation; sound velocity; model; low temperature specific heat; La Sr Cu O  
  Abstract We have measured the thermal conductivity, sound attenuation and relative variation of sound velocity of compounds of the La-Sr-Cu-O and RBa2Cu3O7 families, where R is a rare-earth. We have found that all these properties can be quantitatively correlated within a tunneling system model similar to that used in amorphous materials. This interpretation would naturally explain the anomalous linear term of the low temperature specific heat observed in these materials.  
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  Notes ISI:A1988Q715000009 Approved no  
  Call Number BT @ hernan @ Serial 264  
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Author Osquiguil, E.; Maenhoudt, M.; Wuyts, B.; Bruynseraede, Y.; Lederman, D.; Nieva, G.; Guimpel, J.; Schuller, I.K. url  openurl
  Title Photoexcitation effects in YBa2Cu3Ox Type Journal Article
  Year 1993 Publication Journal of Alloys and Compounds Abbreviated Journal J Alloys Compd  
  Volume 195 Issue C Pages 667-670  
  Keywords Barium compounds; Ceramic materials; Copper oxides; High temperature superconductors; Oxides; Photoelectricity; Yttrium compounds; C-axis oriented films; Photoexcitation effects; Photoinduced phenomena; Yttrium barium cuprates; Superconducting films  
  Abstract We show through photoexcitation experiments carried out on YBa2Cu3Ox c-axis oriented films that photoinduced phenomena are not restricted to insulating samples. Superconducting films with critical temperatures varying between 2 K and 40 K show a clear enhancement of the superconducting transition after illumination. The increase in Tc is accompanied by a corresponding decrease in the resistivity ?, and an increase in the Hall coefficient RH, indicative of an increased carrier density. Furthermore, the carrier mobility is also affected by illumination.  
  Address Physics Department – 0319, University of California – San Diego, La Jolla, CA 92093-0319, United States  
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  ISSN 09258388 (ISSN) ISBN Medium  
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  Notes Cited By (since 1996): 4; Export Date: 17 April 2009; Source: Scopus; CODEN: JALCE; Language of Original Document: English; Correspondence Address: Osquiguil, E.; Laboratorium voor Vaste Stof-Fysika en Magnetisme; Katholieke Universiteit Leuven B-3001 Leuven, Belgium Approved no  
  Call Number BT @ osquigui @ Serial 401  
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Author Sirena, M.; Kaul, E.; Pedreros, M.B.; Rodriguez, C.A.; Guimpel, J.; Steren, L.B. doi  openurl
  Title Structural, magnetic and electrical properties of ferromagnetic/ferroelectric multilayers Type Journal Article
  Year 2011 Publication Journal of Applied Physics Abbreviated Journal J. Appl. Phys.  
  Volume 109 Issue 12 Pages 123920  
  Keywords atomic force microscopy; barium compounds; electrical conductivity; ferroelectric materials; ferromagnetic materials; lanthanum compounds; magnetic multilayers; magnetisation; multiferroics; sputter deposition; strontium compounds; superlattices; texture; tunnelling; X-ray diffraction  
  Abstract The La0.75Sr0.25MnO3 (LSMO)/Ba0.7Sr0.3TiO3 (BSTO) superlattices and bilayers, where LSMO is ferromagnetic and BSTO is ferroelectric, were grown by dc sputtering. X-ray diffraction indicates that the samples present a textured growth with the c axis perpendicular to the substrate. Magnetization measurements show a decrease of the sample’s magnetization for decreasing ferromagnetic thickness. This effect could be related to the presence of biaxial strain and a magnetic dead layer in the samples. Conductive atomic force microscopy indicates that the samples present a total covering of the ferromagnetic layer for a ferroelectric thickness higher than four unit cells. Transport tunneling of the carriers seems to be the preferred conduction mechanism through the ferroelectric layer. These are promising results for the development of multiferroic tunnel junctions.  
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  Call Number BT @ jguimpel @ Serial 606  
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