EPR and optical-absorption studies of Cmsup3+ in YPO/sub 4/ and LuPO/sub 4/ single crystals

Journal Article · Sun Mar 01 04:00:00 EST 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.3057· OSTI ID:5921498

Abraham, M M; Boatner, L A; Finch, C B; Kot, W K; Conway, J G; Shalimoff, G V; Edelstein, N M

/sup 244/Cm/sup 3+/ has been incorporated as a dilute impurity in single crystals of the tetragonal-symmetry lanthanide orthophosphate hosts, LuPO/sub 4/ and YPO/sub 4/. EPR spectroscopic observations were made of all of the excited doublets in the ground /sup 8/S/sub 7/2/ multiplet of Cm/sup 3+/ in both host crystals. Excited-state resonances were observed at both 77 and 4.2 K by use of X-band frequencies. The observed axial g values were used to compute the admixed wave functions for all four doublet levels in the ground manifold of Cm/sup 3+/ and to calculate the g value expected for the lowest-lying doublet that could not be observed by EPR spectroscopy. Optical-absorption and Zeeman-effect investigations were carried out for the case of Cm/sup 3+/ in YPO/sub 4/, and a ground-state g value was obtained for the lowest-lying doublet in the ground-state manifold that was in excellent agreement with the value predicted by use of EPR results for the three excited-doublet levels. The Mohr-circle construction was used to obtain additional information regarding the nature of the crystal-field interaction for Cm/sup 3+/ in the two crystal systems. In particular, the tetragonal crystal-field interaction was found to be stronger in the YPO/sub 4/ host than in LuPO/sub 4/. Additionally, the crystal-field-induced admixtures were found to be smaller at 77 K than at 4.2 K for both hosts, and the signs of the Steven's parameters were determined to be positive for b/sub 4//sup 0/ and negative for b/sub 2//sup 0/.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
• OSTI ID: 5921498
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:7; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ABSORPTIVITY
CERIUM IONS
CHARGED PARTICLES
CRYSTAL FIELD
CRYSTALS
DATA
ELECTRON SPIN RESONANCE
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FUNCTIONS
IMPURITIES
INFORMATION
IONS
LANDE FACTOR
LOW TEMPERATURE
LUTETIUM COMPOUNDS
LUTETIUM PHOSPHATES
MAGNETIC RESONANCE
MONOCRYSTALS
NUMERICAL DATA
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RESONANCE
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
WAVE FUNCTIONS
YTTRIUM COMPOUNDS
YTTRIUM PHOSPHATES
ZEEMAN EFFECT