/sup 57/Fe Moessbauer study of the superconductor YBa/sub 2/(Fe/sub x/Cu/sub 1/. sqrt. /sub x/)/sub 3/O/sub y/

Journal Article · Sun May 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.7967· OSTI ID:5185526

Baggio-Saitovitch, E; Souza Azevedo, I; Scorzelli, R B; Saitovitch, H; da Cunha, S F; Guimaraes, A P; Silva, P R; Takeuchi, A Y

/sup 57/Fe Moessbauer measurements were made on the YBa/sub 2/(Fe/sub x/Cu/sub 1/..sqrt../sub x/)/sub 3/O/sub y/ superconducting compounds, for the Fe concentrations of x = 0.001, 0.005, 0.01, 0.03, and 0.1. The Moessbauer spectra, obtained from 4.2 K to room temperature, are dependent on concentration and show several quadrupole doublets that can be related to different Cu sites, to the number of oxygen vacancies, and to the presence of a high-temperature tetragonal phase. Two doublets in the dilute samples (up to x = 0.01) are associated to /sup 57/Fe in the Cu1 site of the compound with different oxygen configurations. X-ray diffraction and Moessbauer spectroscopy indicate that the YBaCuO structure is strongly perturbed for higher iron concentration. dg magnetization measurements show a correlated decrease of the transition temperature T/sub c/. The 4.2-K spectra of the more concentrated samples (x = 0.03 and 0.1) show complex magnetic hyperfine patterns indicating the presence of magnetic moments on the Fe.

• Research Organization: Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud, 150, 22290 Rio de Janeiro, Rio de Janiero, Brazil
• OSTI ID: 5185526
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:13; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON 57
IRON ADDITIONS
IRON ALLOYS
IRON COMPOUNDS
IRON ISOTOPES
IRON OXIDES
ISOTOPES
LOW TEMPERATURE
MAGNETIZATION
MATERIALS
MEDIUM TEMPERATURE
MOESSBAUER EFFECT
NUCLEI
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
SCATTERING
STABLE ISOTOPES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES