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Temperature Dependence of the EPR Spectra of Gd 0.5 RE 0.5 Ba 2 Cu 3 O 7‐δ Compounds in the Orthorhombic and Tetragonal Phases
Author(s) -
Guskos N.,
Triberis G. P.,
Lykodimos V.,
Windsch W.,
Metz H.,
Koufoudakis A.,
Mitros C.,
GamariSeale H.,
Niarchos D.
Publication year - 1991
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221660125
Subject(s) - electron paramagnetic resonance , tetragonal crystal system , polaron , orthorhombic crystal system , spectral line , materials science , ion , phase (matter) , crystallography , condensed matter physics , analytical chemistry (journal) , nuclear magnetic resonance , chemistry , crystal structure , physics , electron , organic chemistry , astronomy , quantum mechanics , chromatography
The materials Gd 0.5 RE 0.5 Ba 2 Cu 3 O 7‐δ (Re = Y, Sm, Eu, and La) are investigated in the orthorhombic (HTC) and tetragonal (non‐HTC) phases using EPR method. For both phases EPR signals associated with Gd ions are detected. In the tetragonal phase a strong temperature dependence of the intensities of this line is observed. These characteristics can be ascribed to the skin effect. A small polaron model is proposed to interpret the conduction mechanism of the tetragonal phase (semiconducting) of these samples.