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/sup 57/Fe M/umlt o/ssbauer study of the Tl/sub 2/Ca/sub 1. 5/Ba/sub 1. 7/(Cu/sub 1/minus//ital x//Fe/sub /ital x//)/sub 3/O/sub 9/ superconductor

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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The results of /sup 57/Fe M/umlt o/ssbauer-effect studies onhigh-/ital T//sub /ital c// Tl/sub 2/Ca/sub 1.5/Ba/sub 1.7/(Cu/sub 1/minus//ital x//Fe/sub /ital x//)/sub 3/O/sub 9/with /ital x/=0.01, 0.05, and 0.07 are reported in this paper. TheM/umlt o/ssbauer spectra depend on concentration and show three quadrupole doubletsthat can be related to different Cu sites at different phases and to the numberof oxygen vacancies. The site preference of Fe is identified by fittedM/umlt o/ssbauer results. The parameter of a M/umlt o/ssbauer spectrum run at 77 Kindicates that in the superconducting state the density of /ital s/ electrons atCu sites is different from that of the normal state. The data from x-raydiffraction are given for /ital x/=0.01 and 0.07 and analyzed resultsshow that the 2:1:2:2 phase and 2:2:2:3 phase have an intergrowth in oursamples.

Research Organization:
Department of Physica, Beijing Normal University, Beijing 100875, China(CN)
OSTI ID:
5952938
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 40:1; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFRACTION
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
IRON 57
IRON COMPOUNDS
IRON ISOTOPES
IRON OXIDES
ISOTOPES
LOW TEMPERATURE
MOESSBAUER EFFECT
NUCLEI
OXIDES
OXYGEN COMPOUNDS
QUANTITY RATIO
SCATTERING
STABLE ISOTOPES
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION