Magnetic behavior of Ho/sub 1/Ba/sub 2/(Cu/sub 1-x/Fe/sub x/)/sub 3/ O/sub 7-y/

Conference · Fri Jul 01 04:00:00 EDT 1988

OSTI ID:7127654

Violet, C E; Hahn, P A

We have carried out dc magnetization (x = 0, and 0.05) and /sup 57/Fe Moessbauer spectroscopy (x = 0.05) measurements of Ho/sub 1/Ba/sub 2/(Cu/sub 1/minus/x/Fe/sub x/)/sub 3/O/sub 7/minus/y/ between room temperature (RT) and 4.2K. Based on x-ray diffraction results all samples are single phase, and either orthorhombic (x = 0) or tetragonal (x = 0.05). Magnetization measurements determined the onset T/sub c/ to be either 90K (orthorhombic) or 48K (tetragonal). Moessbauer spectra between RT and 20K are nearly identical, each consisting of three superposed quadrupole doublets. As the temperature is lowered below about 10K, the Moessbauer spectra exhibit paramagnetic relaxation. The relaxation time increases by about two orders of magnitude as the temperature decreases from 10K to 4.2K. No magnetic ordering of the Fe moments was observed. 9 refs., 4 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7127654
• Report Number(s): UCRL-98201-Rev.1; CONF-880703-5-Rev.1; ON: DE88015439
• 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
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
EVEN-ODD NUCLEI
HOLMIUM COMPOUNDS
HOLMIUM OXIDES
INTERMEDIATE MASS NUCLEI
IRON 57
IRON COMPOUNDS
IRON ISOTOPES
IRON OXIDES
ISOTOPES
MAGNETIC PROPERTIES
MAGNETIZATION
MOESSBAUER EFFECT
NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE