Ground-state wave functions of Tb[sup 3+] ions in paramagnetic TbPO[sub 4]: A neutron scattering study
- Intense Pulsed Neutron Source, Chemistry and Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4814 (United States)
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6056 (United States)
The paramagnetic-excitation spectrum of TbPO[sub 4] has been investigated by means of inelastic neutron-scattering techniques, and the observed crystal-field transitions were analyzed using a Hamiltonian that included the atomic free-ion and crystal-field interactions for an [ital f][sup 8] configuration. Five parameters for the crystal-field potential were obtained that provided a satisfactory description of the neutron data collected at temperatures between 4.2 and 150 K. The calculated crystal-field contribution to the specific heat in the 4--10 K temperature range and the paramagnetic susceptibility agree well with the experimental results. The large anisotropy of the magnetic ground-state doublet of the Tb ions with respect to the crystallographic [ital c] axis has important consequences for the spin structure in the antiferromagnetic phases at low temperatures. The effective internal magnetic field in antiferromagnetic TbPO[sub 4] was estimated based on the crystal-field-level scheme and a molecular-field approximation and was found to be in good agreement with the values reported from other measurements.
- DOE Contract Number:
- W-31109-ENG-38; AC05-84OR21400
- OSTI ID:
- 6301180
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:9; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BEAMS
CHARGED PARTICLES
CRYSTAL FIELD
ELECTRONIC STRUCTURE
ENERGY LEVELS
FUNCTIONS
GROUND STATES
INELASTIC SCATTERING
IONS
MAGNETISM
NEUTRON BEAMS
NUCLEON BEAMS
OXYGEN COMPOUNDS
PARAMAGNETISM
PARTICLE BEAMS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SPECIFIC HEAT
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TERBIUM IONS
TERBIUM PHOSPHATES
THERMODYNAMIC PROPERTIES
WAVE FUNCTIONS