NMR in CeAl/sub 2/: Crystal-field effects and magnetic order in the low-temperature phase

Journal Article · Wed Mar 01 00:00:00 EST 1978 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.324758· OSTI ID:5123349

MacLaughlin, D E; Hewitt, R R

/sup 27/Al NMR spectra have been observed in polycrystalline CeAl/sub 2/ for temperatures between 2 and 295 K. Frequency shifts, quadrupole couplings and linewidths have been obtained in the paramagnetic phase above T/sub c/=3.8 K. The isotropic shift K/sup prime/ /sub i/ due to Ce/sup 3 +/ spin polarization indicates a marked decrease of the /sup 27/Al hyperfine field H/sub hf/=K/sup prime/ /sub i//chi with increasing temperature. A non-dipolar contribution to the anisotropic shift scales with the observed K/sup prime/ /sub i/. Both these results can be accounted for only by an anisotropic local moment-conduction electron coupling. Below T/sub c/ the NMR line broadens appreciably, attaining a field-independent value at very low temperatures. This observation is consistent with the onset of magnetic ordering, although the absence of a large shift and the magnitude of the linewidth are not understood.

• Research Organization: Department of Physics, University of California, Riverside, California 92521
• OSTI ID: 5123349
• Journal Information: J. Appl. Phys.; (United States), Vol. 49:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM ALLOYS
MAGNETIC PROPERTIES
ALUMINIUM BASE ALLOYS
CRYSTAL FIELD
LINE WIDTHS
MAGNETIC MOMENTS
NUCLEAR MAGNETIC RESONANCE
PARAMAGNETISM
SPECTRAL SHIFT
TEMPERATURE DEPENDENCE
ALLOYS
ALUMINIUM ALLOYS
MAGNETIC RESONANCE
MAGNETISM
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
RESONANCE
360102* - Metals & Alloys- Structure & Phase Studies