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Author (up) Causa, M. T.; Dutrús, S. M.; Fainstein, C.; Nieva, G.; Salva, H. R.; Sánchez, R. D.; Steren, L. B.; Tovar, M.; Zysler R. doi  openurl
  Title MAGNETIC AND STRUCTURAL PROPERTIES OF SOME ABa2Cu3O7?? SUPERCONDUCTORS Type Journal Article
  Year 1987 Publication International Journal of Modern Physics B Abbreviated Journal International Journal of Modern Phys. B  
  Volume 1 Issue 3-4 Pages 989-992  
  Keywords  
  Abstract We report here normal and superconducting properties of ABa2Cu3O7?? (with A=Y, Gd, Dy, and Er) and of Fe doped YBa2Cu3O7??. Results from X-ray powder diffraction, electrical resistivity, magnetic susceptibility, ESR, and specific heat measurements are presented, leading to a characterization of the magnetic properties of these materials. The effect of structural modifications of the lattice on the superconducting properties and the relative insensitivity of Tc to the presence of magnetic moments is discussed.  
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  Series Volume Series Issue Edition  
  ISSN 0217-9792 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 427  
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Author (up) Causa, M. T.; Fainstein, C.; Nieva, G.; S\'anchez, R.; Steren, L. B.; Tovar, M.; Zysler, R.; Vier, D. C.; Schultz, S.; Oseroff, S. B.; Fisk, Z.; Smith, J. L. openurl 
  Title Crystal-field interaction in the GdxEu1-xBa2Cu3O7-? superconductors Type Journal Article
  Year 1988 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 38 Issue Pages 257-261  
  Keywords  
  Abstract We report here experimental data on the crystal-field interaction of gadolinium ions with their environment in GdxEu1-xBa2Cu3O7-?. The ESR spectrum and a Schottky anomaly in the specific heat of dilute samples (x?1) indicate the existence of a crystal-field splitting of the 8S7/2 ground state of Gd3+ ions of about 1.5 K. We discuss the parametrization of the measured splitting in terms of an effective Hamiltonian, and the microscopic origin of the interaction within the framework of a superposition model. Since the single-ion energies involved are of the same order of magnitude as the energies associated with the magnetic ordering of the Gd3+ moments in GdBa2Cu3O7-? (TN?2.24 K), we analyze the effects of the crystal-field interaction on the magnetic transition.  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 433  
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Author (up) Causa, M.T.; Dutrus, S.M.; Fainstein, C.; Nieva, G.; Sanchez, R.; Steren, L.B.; Tovar, M.; Zysler, R.; Oseroff, S.B.; Vier, D.C.; Schultz, S.; Fisk, Z.; Smith, J.L. openurl 
  Title Magnetic ordering in dilute GdxEu1−xBa2Cu3O7−δ superconductors Type Journal Article
  Year 1988 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 153 Issue Pages 188-189  
  Keywords  
  Abstract We have measured the specific heat of GdxEu1−xBa2Cu3O7−δ (0 ≤ × ≤ 1). The data show a λ-type anomaly at high concentrations and a broad Schottky type anomaly at intermediate and low concentrations. We compare this behavior with theoretical predictions for a 2-dimensional Ising system.  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 432  
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Author (up) Causa, M.T.; Fainstein, C.; Nieva, G.; Sánchez, R.; Steren, L. B.; Tovar, M.; Zysler, R.; Vier, D. C.; Schultz, S.; Oseroff, S. B.; Fisk, Z.; Smith, J. L. isbn  openurl
  Title Crystal Field Interaction and Magnetic Order in GdBa2Cu3O7 Type Book Chapter
  Year 1988 Publication Progress in High Temperature Superconductivity Abbreviated Journal  
  Volume 5 Issue Pages  
  Keywords  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher World Scientific Place of Publication N.J. Editor J. L. Heiras  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN 978-9971505837 Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 430  
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Author (up) Durán, C.; Esquinazi, P.; Fainstein, C.; Núñez Regueiro, M. url  doi
openurl 
  Title Anomalies in the internal friction and sound velocity in YBa2Cu3O7-x and EuBa2Cu3O7-x superconductors Type Journal Article
  Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.  
  Volume 65 Issue 9 Pages 957-961  
  Keywords  
  Abstract Internal friction Q-1 and Young Modulus sound velocity vE measurements at 1 kHz in YBa2Cu3O7?x and EuBa2Cu3O7?x polycrystalline samples reveal anomalies at the superconducting transition and at not, vert, similar37 K. The anomaly in vE at not, vert, similar90 K is accompanied by an absorption peak and is in agreement with published ultrasonic measurements, suggesting a lattice deformation at the superconducting transition.  
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  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 569  
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Author (up) Esquinazi, P.; Durán, C.; Fainstein, C.; Núñez Regueiro, M. url  doi
openurl 
  Title Evidence of low-energy tunneling excitations in the high-Tc superconductor YBa2Cu3O7-x Type Journal Article
  Year 1988 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 37 Issue 1 Pages 545-547  
  Keywords  
  Abstract We have measured the internal friction Q-1 and the Young's-modulus sound velocity vE at 1 kHz for YBa2Cu3O7-x. Below 20 K the relative change in the sound velocity and the temperature dependence of the internal friction perfectly resemble the behavior obtained for Suprasil W. Below 1 K we observe a logarithmic temperature dependence for the sound velocity and between 1 and 5 K a well-defined plateau in the internal friction is obtained. We find quantitative agreement with the predictions of the standard tunneling model which is widely used to explain the low-temperature properties of amorphous materials. The implications of the existence of tunneling systems in these materials are discussed.  
  Address  
  Corporate Author Thesis  
  Publisher American Physical Society Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
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  Notes Approved no  
  Call Number BT @ pedrazp @ 10.1103/PhysRevB.37.545 Serial 576  
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Author (up) Izbizky, M.A.; Núñez Regueiro, M.; Esquinazi, P.; Durán, C.; Fainstein, C. url  doi
openurl 
  Title Phonon transport in superconducting EuBa2Cu3O7-x Type Journal Article
  Year 1988 Publication Physics Letters A Abbreviated Journal Phys. Lett. A  
  Volume 129 Issue 1 Pages 71-75  
  Keywords  
  Abstract We have measured the thermal conductivity, Young modulus sound velocity and internal friction of a polycrystalline sample of the ceramic superconductor EuBa2Cu3O7-x. The low temperature data can be quantitavely understood assuming the interaction of phonons with tunneling systems.  
  Address  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0375-9601 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 571  
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Author (up) Izbizky, M.A.; Núñez Regueiro, M.; Esquinazi, P.; Fainstein, C. url  doi
openurl 
  Title Thermal conductivity and superconductivity in EuBa2Cu3O7-x Type Journal Article
  Year 1988 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 38 Issue 13 Pages 9220-9223  
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  Address  
  Corporate Author Thesis  
  Publisher American Physical Society Place of Publication Editor  
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  Notes Approved no  
  Call Number BT @ pedrazp @ 10.1103/PhysRevB.38.9220 Serial 573  
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Author (up) Massa, N. E.; Rasines, I.; Nieva, G.; Campá, J. A.; Fainstein, C. openurl 
  Title Far infrared transmission spectra of Bi2Sr2Ca1(Cu1−x,Znx)2O8+δ, 0.0≤x≤0.05, crystallites in the normal state: Detection of superconducting gap precursors Type Journal Article
  Year 1994 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 235-240 Issue 2 Pages 1065-1066  
  Keywords  
  Abstract We report transmission spectra of crystallites, taken from single crystal specimens of two plane Bi2Sr2Ca1(Cu1−x,Znx)2O8+δ, 0.0≤x≤0.05, diluted in CsI or polyethylene matrices In addition to weaker features assigned to unscreened phonons and a continuous background probably due to carriers, we found that the ratios of room temperature spectra to those taken lowering the temperature in 50 degrees intervals signal the presence of superconducting gap behavior with 2Δ/kBTc6. We verified this by down shifting frequency as a function of Zn increment and the lowering of Tc induced by this strong superconductivity suppressor. Our preliminary search for phonons self-energy effects close to the superconducting transition temperature gave negative results.  
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  Notes Approved no  
  Call Number BT @ gnieva @ Serial 452  
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Author (up) Massa, N.E.; Campa, J.; Rasines, I.; Fainstein, C.; Nieva, G. openurl 
  Title Superconducting order parameter and the phonon profile in the bismuth family of compounds Type Journal Article
  Year 1996 Publication Anales de la Asociación Química Argentina Abbreviated Journal  
  Volume 84 Issue 1 Pages 7-12  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0365-7124 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 464  
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