Abstract
The enhanced nuclear magnetic resonance (n. m. r.) spectrum of
169
Tm (
I
= ½) in the tetragonal compound TmPO
4
has been measured from 1.6 K to 30 K. It is highly anisotropic, with
γ
/2π = 11.34 and 276MHzT
-1
, parallel and perpendicular to the
c
-axis respectively, at the lowest temperatures. The corresponding values of the Van Vleck electronic susceptibility per ion are 0.0231 and 0.805
μ
B
T
-1
. Above 4 K the values of
γ
/2π become temperature dependent as excited levels become populated, and the results are discussed in the light of a crystal field calculation of the energy levels and wave functions. The n. m. r. spectrum of
31
P (
I
= ½) is shown to exhibit an anisotropic paramagnetic shift, mainly dipolar in origin, exactly proportional to the electronic susceptibility of the Tm
3+
ions, and this is used to extrapolate the measurement of
γ
for
169
Tm up to 64 K in the perpendicular direction. A simple calculation of the direct process for spin-lattice relaxation shows that this is orders of magnitude too slow to account for the observed relaxation rates, which must be ascribed to the presence of paramagnetic impurities.
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4
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