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Author Decca, R.; Osquiguil, E.; de la Cruz, F.; D'Ovidio, C.; Malachevski, M.T.; Esparza, D. url  doi
openurl 
  Title Non linear temperature dependence of the resistivity of LaSrCuO: Effects of Sr content Type Journal Article
  Year 1989 Publication Solid State Communications Abbreviated Journal Solid State Commun.  
  Volume 69 Issue 4 Pages 355-357  
  Keywords Ceramic Materials; Lanthanum Compounds--Electric Conductivity; Superconductivity; Ceramic Superconductors; Superconducting Materials  
  Abstract The linear temperature dependence of the electrical resistivity has been taken to be one of the characteristic features of the ceramic superconductors. Measurements of the electrical resistance of the LaSrCuO system in a wide temperature range show that the previous statement is only an approximation valid for some values of the Sr concentration.  
  Address Applied Research Department, Centro At'omico Bariloche  
  Corporate Author Thesis  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 00381098 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Decca, R.; Basic Research Department; Centro At Approved no  
  Call Number BT @ osquigui @ Serial 414  
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Author Esparza, D.A.; D'Ovidio, C.A.; Guimpel, J.; Osquiguil, E.; Civale, L.; de la Cruz, F. url  doi
openurl 
  Title The granular nature of bulk superconductivity at 40K in La1.8Sr0.2CuO4 Type Journal Article
  Year 1987 Publication Solid State Communications Abbreviated Journal Solid State Commun.  
  Volume 63 Issue 2 Pages 137-140  
  Keywords CERAMIC MATERIALS; GRANULAR MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CRITICAL FIELDS; HIGH TEMPERATURE SUPERCONDUCTOR; MAGNETIC FLUX EXPULSION; TEMPERATURE DEPENDENCE; SUPERCONDUCTING MATERIALS  
  Abstract We have measured the electrical resistivity, magnetic flux expulsion and critical fields of the new high temperature superconductor La1.8Sr0.2CuO4 after different heat treatments. Our data show that the complete flux expulsion in these samples is consistent with the presence of shielding currents induced in multiple connected structures. The magnetization measurements indicate that the lowest field where flux penetrates into the sample should not be taken to be the bulk Hcl. It is shown that the absolute value of the electrical resistivity and its temperature dependence are not correlated with the superconducting critical field and temperature. We discuss the behaviour of the superconducting parameters and their relation with the electrical resistivity.  
  Address Basic Research Department, Centro At  
  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 00381098 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Esparza, D.A.; Applied Research Department; Centro At Approved no  
  Call Number BT @ osquigui @ Serial 418  
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Author Franco, D.G.; Carbonio, R.E.; Nieva, G. doi  openurl
  Title Magnetic Properties of the Double Perovskites LaPbMSbO6 (M = Mn, Co, and Ni) Type Journal Article
  Year 2013 Publication IEEE Transactions on Magnetics Abbreviated Journal IEEE Trans. Magn.  
  Volume 49 Issue 8 Pages 4594-4597  
  Keywords X-ray diffraction; cobalt compounds; lanthanum compounds; lead compounds; magnetisation; manganese compounds; nickel compounds; paramagnetic-antiferromagnetic transitions; space groups; superexchange interactions; LaPbCoSbO6; LaPbMnSbO6; LaPbNiSbO6; M2+ distribution; Rietveld analysis; Sb5+ distribution; X-ray powder diffraction pattern; antiferromagnetic coupling; antiferromagnetic transition; aqueous synthetic route; disorder; double perovskites; ferrimagnetic characteristics; interaction paths; magnetic ions; magnetic properties; monoclinic crystals; octahedral sites; polycrystals; space group P2 1/n; super-superexchange paths; Ions; Magnetic properties; Magnetization; Manganese; Nickel; Temperature measurement; X-ray diffraction; Antiferromagnetic materials; transition metal compounds  
  Abstract New double perovskites LaPbMSbO6, where M2+ = Mn2+, Co2+, and Ni2+, were synthesized as polycrystals by an aqueous synthetic route at temperatures below 1000 °C. All samples are monoclinic, space group P21/n, as it is observed from Rietveld analysis of X-ray powder diffraction patterns. The distribution of M2+ and Sb5+ among the two octahedral sites have 3% of disorder for M2+ = Ni2+, whereas for M2+ = Mn2+ and Co2+ less disorder is found. The three samples have an antiferromagnetic transition, due to the antiferromagnetic coupling between M2 + through super-superexchange paths M2+-O2--Sb5+-O2--M2+. Transition temperatures are low: 8, 10 and 17 K for Mn2+, Co2+, and Ni2 + respectively, as a consequence of the relatively long distances between the magnetic ions M2+. Besides, for LaPbMnSbO6 a small transition at 45 K was found, with ferrimagnetic characteristics, possibly as a consequence of a small disorder between Mn2+ and Sb5+. This disorder would give additional and shorter interaction paths: superexchange Mn2+-O2--Mn2+.  
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  ISSN 0018-9464 ISBN Medium  
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  Call Number BT @ pedrazp @ Serial 669  
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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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  ISSN 0003-4169 ISBN Medium  
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  Notes ISI:A1988Q715000009 Approved no  
  Call Number BT @ hernan @ Serial 264  
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Author Osquiguil, E.; Decca, R.; Nieva, G.; Civale, L.; de la Cruz, F. url  doi
openurl 
  Title La1.80 Sr0.20 CuO4-delta a clean limit superconductor Type Journal Article
  Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.  
  Volume 65 Issue 6 Pages 491-494  
  Keywords CERAMIC MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CERAMIC SUPERCONDUCTORS; CLEAN LIMIT SUPERCONDUCTOR; HIGH-TEMPERATURE SUPERCONDUCTORS; OXYGEN CONCENTRATION; SUPERCONDUCTING MATERIALS  
  Abstract The electrical resistivity of the superconductor La1.80Sr0.20Cu04-? has been measured in a wide range of temperatures as a function of oxygen and vacuum heat treatments. The resistivity changes reversibly orders of magnitude with oxygen concentration. There is no sign of saturation at high temperatures, even for samples where the resistivity is increased by heat treatment in vacuum. Using the experimental data and general arguments it is concluded that the ceramic superconductors are high ? materials in the clean limit.  
  Address Instituto Balseiro 8400 Bariloche, R.N., Argentina# # Comisi  
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  Series Volume Series Issue Edition  
  ISSN 00381098 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Osquiguil, E. Approved no  
  Call Number BT @ osquigui @ Serial 416  
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Author Rodr url  openurl
  Title Role of anisotropy in the vortex lattice of superconductors high-Q oscillator measurements in 2H-NbSe2 and La1.825Sr0.075CuO4 Type Journal Article
  Year 1994 Publication Physica C: Superconductivity and its applications Abbreviated Journal Phys C Supercond Appl  
  Volume 229 Issue 1-2 Pages 59-64  
  Keywords Anisotropy; Copper oxides; High temperature superconductors; Lanthanum compounds; Magnetic field effects; Niobium compounds; Oscillators (mechanical); Phase transitions; Superconductivity; Thickness measurement; Angular dependence; Ginzburg Landau theory; Pinning; Crystal lattices  
  Abstract Measurement of the response of the flux-line lattice in NbSe2 and La1.825Sr0.075CuO4 show important differences between these two materials. In particular, we have studied the magnetic-field and angular dependence of the response of a high-Q mechanical oscillator in fields of up to 1 T. The features seen in NbSe2 seem to be well explained in terms of a change in the pinning regime, usually termed the “peak effect” in the critical current, using the collective-pinning model of Larkin and Ovchivnikov within Ginzburg-Landau anisotropic theory. On the other hand the behavior found in the high-Tc material LSCO seems to fall naturally into a description which takes into account the possibility of phase transitions in the vortex lattice and the quasi-two-dimensional character of the superconductivity.  
  Address AT and T Bell Laboratories, Murray hill, NJ 07974, USA  
  Corporate Author Thesis  
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  Series Volume Series Issue Edition  
  ISSN 09214534 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Cited By (since 1996): 2; Export Date: 28 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Comisi Approved no  
  Call Number BT @ luzuriag @ Serial 484  
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Author Rodr url  openurl
  Title Role of anisotropy in the vortex lattice of superconductors high-Q oscillator measurements in 2H-NbSe2 and La1.825Sr0.075CuO4 Type Journal Article
  Year 1994 Publication Physica C: Superconductivity and its applications Abbreviated Journal Phys C Supercond Appl  
  Volume 229 Issue 1-2 Pages 59-64  
  Keywords Anisotropy; Copper oxides; High temperature superconductors; Lanthanum compounds; Magnetic field effects; Niobium compounds; Oscillators (mechanical); Phase transitions; Superconductivity; Thickness measurement; Angular dependence; Ginzburg Landau theory; Pinning; Crystal lattices  
  Abstract Measurement of the response of the flux-line lattice in NbSe2 and La1.825Sr0.075CuO4 show important differences between these two materials. In particular, we have studied the magnetic-field and angular dependence of the response of a high-Q mechanical oscillator in fields of up to 1 T. The features seen in NbSe2 seem to be well explained in terms of a change in the pinning regime, usually termed the “peak effect” in the critical current, using the collective-pinning model of Larkin and Ovchivnikov within Ginzburg-Landau anisotropic theory. On the other hand the behavior found in the high-Tc material LSCO seems to fall naturally into a description which takes into account the possibility of phase transitions in the vortex lattice and the quasi-two-dimensional character of the superconductivity.  
  Address AT and T Bell Laboratories, Murray hill, NJ 07974, USA  
  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 09214534 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Cited By (since 1996): 2; Export Date: 28 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Comisi Approved no  
  Call Number BT @ luzuriag @ Serial 520  
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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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  Notes Approved no  
  Call Number BT @ jguimpel @ Serial 606  
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