Vibrational and electronic anomalies near Tc in tetragonal superconducting YBa2(Cu0.9557Fe0.05)3O7.1
Ημερομηνία
1988Συγγραφέας
Kimball, C. W.Matykiewicz, J. L.
Lee, H.
Giapintzakis, John
Dwight, A. E.
Dunlap, B. D.
Jorgensen, J. D.
Veal, B. W.
Fradin, F. Y.
Source
Physica C: Superconductivity and its applicationsVolume
156Pages
547-554Google Scholar check
Keyword(s):
Metadata
Εμφάνιση πλήρους εγγραφήςΕπιτομή
Mössbauer effect studies have been made as a function of temperature for the orthorhombic (χ=0.01, 0.02) and tetragonal (χ=0.05) superconducting compounds YBa2(Cu1-χ57Feχ)3O7 + y. For Fe in or slightly displaced from the Cu1 (000) site, temperature dependent measurements yield Debye temperatures for the Mössbauer shift θδ in the range of 601 to 698 K and for the resonant fraction θf in the range from 333 to 568 K, depending on the local oxygen configuration. Very little change is observed in the region of the superconducting transition Tc for the orthorhombic phase samples, but both phonon and electronic changes occur near Tc in the tetragonal phase. The vibrational behavior of Fe in the Cu1 site shows a dramatic hardening near and below Tc in tetragonal YBa2(Cu0.95Fe0.05)3O7.1. The quadrupolar splitting EQ indicates a change in field gradient in this same temperature region. The Mössbauer shift also behaves anomalously near Tc. © 1988.