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Haberkorn, N.; Bridoux, G.; Osquiguil, E.; Nieva, G.; Guimpel, J. |
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Title |
Hall effect in a GdBa2Cu3O7-?/La0.75 Sr0.25MnO3 perovskite bilayer |
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2007 |
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Applied Surface Science |
Abbreviated Journal |
Appl. Surf. Sci. |
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254 |
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1 SPEC. ISS. |
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222-224 |
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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 |
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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. |
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Instituto Balseiro, Universidad Nacional de Cuyo, Comisi |
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01694332 (ISSN) |
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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 |
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BT @ osquigui @ |
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363 |
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Núñez Regueiro, M.; Esquinazi, P.; Izbizky, M.A.; Durán, C.; Castello, D.; Luzuriaga, J. |
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Title |
Tunneling systems in high temperature superconductors |
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Journal Article |
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1988 |
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Annales de Physique |
Abbreviated Journal |
Ann. Phys. Fr. |
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13 |
Issue |
5 |
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401-406 |
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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 |
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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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0003-4169 |
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ISI:A1988Q715000009 |
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BT @ hernan @ |
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264 |
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Rodriguez, E.; Luzuriaga, J.; Núñez Regueiro, M.; Fainstein, C. |
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Title |
Low temperature internal friction peak in high Tc superconductors |
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Journal Article |
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1991 |
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Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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77 |
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10 |
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777-780 |
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Ceramic Materials; Oxides – Acoustic Properties; Yttrium Compounds – Acoustic Properties; Acoustic Variables Measurement; Attenuation Peak; Calcium Compounds; Low Temperature Internal Friction Peak; Strontium Compounds; Thermally Activated Relaxation Behavior; High Temperature Superconductors |
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We measure the internal friction Q-1 in YBa2Cu3O7-x and Bi2Sr2CaCu2O8+x samples. At temperatures near 35 K for KHz frequencies we observe an attenuation peak. In the case of YBa2Cu3O7-x, assuming a thermally activated relaxation behaviour, we are able to show that it corresponds to the same process as other peaks observed at higher frequencies. For Bi2Sr2CaCu2O8+x this is not the case, and the origin of the peak, found in all the measured samples, remains unknown. |
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0038-1098 |
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ISI:A1991FA71400006 |
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BT @ hernan @ |
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256 |
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Author |
Sirena, M.; Kaul, E.; Pedreros, M.B.; Rodriguez, C.A.; Guimpel, J.; Steren, L.B. |
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Title |
Structural, magnetic and electrical properties of ferromagnetic/ferroelectric multilayers |
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Journal Article |
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2011 |
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Journal of Applied Physics |
Abbreviated Journal |
J. Appl. Phys. |
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Volume |
109 |
Issue |
12 |
Pages |
123920 |
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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 |
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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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BT @ jguimpel @ |
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606 |
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