NON-DIPOLAR INTERACTION BETWEEN NEAREST NEIGHBOR NEODYMIUM IONS IN THE ETHYL SULFATE.
Technical rept. no. 12,
CALIFORNIA UNIV BERKELEY
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Measurements made on the EPR spectrum of a pair of interacting nearest neighbor neodymium ions in lanthanum ethyl sulphate show that the interaction is predominantly dipolar but that there is also a non-dipolar interaction. A semiquantitative discussion is given of the possible origins of this non-dipolar contribution including superexchange, electric quadrupole-quadrupole, and virtual phonon exchange interactions. Author