Investigation of the samarium role in the physical properties of Sm sub 0. 5 Re sub 0. 5 Ba sub 2 Cu sub 3 O sub 7 minus. delta. compounds in the orthorhombic and tetragonal structures

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Modern Physics Letters B; (Singapore)

DOI:https://doi.org/10.1142/S0217984991001192· OSTI ID:5163392

Guskos, N; Likodimos, W; Londos, C A; Trikalinos, C ^[1]; Koufoudakis, A; Mitros, C; Gamari-Seale, H; Niarchos, D ^[2]; Paraskevas, S M ^[3]

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1. Solid State Section, Dept. of Physics, Univ. of Athens, Solonos 104, G-10680 Athens (GR)
2. Inst. of Materials Science, NCSR Democritos, Aghia Paraskevi, G-15310 Athens (GR)
3. Organic Chemistry, Dept. of Chemistry, Univ. of Athens, Navarinou 13A, G-10680 Athens (GR)

This paper reports that Perovskites of type Sm{sub 0.5}Re{sub 0.5}Ba{sub 2}Cu{sub 3}O{sup 7{minus}b} (Re = Y, La, Nd, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu) have been investigated by XRD, magnetic and EPR measurements in both orthorhombic and tetragonal phases. In the former case the usual superconducting phase transition in the range 90 to 95 K has been detected. In al the compounds an EPR spectrum of Cu{sup 2+} ions has been observed. In the tetragonal phase, the EPR spectra of trivalent rare earth ions have ben recorded for some members of the series. The observation of a broad EPR signal, tentatively attributed to superexchange interaction over the oxygen bridges (O{sub 2}), has also been recorded Furthermore, the intensity of low-field microwave absorption has been found to depend strongly on the nature of the substituted rare earth ion at the sites of Y ions of the YBa{sub 2}Cu{sub 3}O{sup 7{minus}b} type compounds.

• OSTI ID: 5163392
• Journal Information: Modern Physics Letters B; (Singapore), Journal Name: Modern Physics Letters B; (Singapore) Vol. 5:14; ISSN 0217-9849; ISSN MPLBE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
COHERENT SCATTERING
COPPER COMPOUNDS
CUPRATES
DIFFRACTION
DYSPROSIUM COMPOUNDS
ELECTRON SPIN RESONANCE
ELEMENTS
ERBIUM COMPOUNDS
EUROPIUM COMPOUNDS
GADOLINIUM COMPOUNDS
HOLMIUM COMPOUNDS
LANTHANUM COMPOUNDS
LUTETIUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
METALS
MICROWAVE SPECTRA
NEODYMIUM COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RARE EARTHS
RESONANCE
SAMARIUM
SAMARIUM COMPOUNDS
SCATTERING
SPECTRA
THULIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTERBIUM COMPOUNDS
YTTRIUM COMPOUNDS