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Author Causa, M. T.; Dutrús, S. M.; Fainstein, C.; Nieva, G.; Salva, H. R.; Sánchez, R. D.; Steren, L. B.; Tovar, M.; Zysler R.
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 (down) 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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ISSN 0217-9792 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ gnieva @ Serial 427
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Author 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.
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 (down) 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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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ gnieva @ Serial 433
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