Electron-paramagnetic-resonance investigations of /sup 243/Cm/sup 3 +/ and /sup 244/Cm/sup 3 +/ in LuPO/sub 4/ single crystals

Journal Article · Sun Aug 01 04:00:00 EDT 1982 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.26.1434· OSTI ID:6722415

Abraham, M M; Boatner, L A

The actinide isotopes /sup 243/Cm and /sup 244/Cm have been incorporated as dilute trivalent impurities in single crystals of lutetium orthophosphate. Electron-paramagnetic-resonance (EPR) spectra of both isotopes were observed at approx.9 GHz and T = 4.2 K, and a positive identification of the Cm/sup 3 +/ resonance was made from the six-line hyperfine pattern characteristic of the I = 5/2 nuclear spin of /sup 243/Cm. The host LuPO/sub 4/ crystal is a tetragonal-symmetry system and the axial Cm/sup 3 +/ g values were determined to be g/sub parallel/ = 7.98(1) and g/sub perpendicular/ = 4.096(4). These values could not be fit to a doublet wave function of the form ..cap alpha..Vertical Bar +- 7/2>+..beta..Vertical Barminus-or-plus1/2> to give a consistent value for the Lande g factor. They could, however, be fit to an excited-state doublet wave function of the form ..cap alpha..Vertical Bar +- 5/2>+..beta..Vertical Barminus-or-plus3/2> to yield a consistent Lande factor of 1.921. The identification of the observed spectra as arising from an excited state was confirmed by the observation that lowering the temperature reduced the intensity of the EPR signals. These results show that the sign of the dominant axial crystal-field term for the 5f/sup 7/ Cm/sup 3 +/ ion in LuPO/sub 4/ is negative and that a predominantly Vertical Bar +- 7/2> state is the ground state.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6722415
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 26:3; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ANGULAR MOMENTUM
CHARGED PARTICLES
CRYSTAL FIELD
CRYSTALS
CURIUM IONS
DATA
ELECTRON SPIN RESONANCE
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FREQUENCY RANGE
FUNCTIONS
GHZ RANGE
GHZ RANGE 01-100
HAMILTONIANS
HYPERFINE STRUCTURE
IMPURITIES
INFORMATION
IONS
LANDE FACTOR
LUTETIUM COMPOUNDS
LUTETIUM PHOSPHATES
MAGNETIC RESONANCE
MATHEMATICAL OPERATORS
MONOCRYSTALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHOSPHATES
PHOSPHORUS COMPOUNDS
QUANTUM OPERATORS
RARE EARTH COMPOUNDS
RESONANCE
SPIN
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
WAVE FUNCTIONS