Abstract
The high-frequency paramagnetic susceptibility χ' (ω, H, T) of cerium ethyl-sulfate was measured at frequencies from 10 MHz to 55 MHz and at temperatures from 1.2 K to 4.2 K. A relaxation rate for the Ce 3+ ions is found which is identified with the Orbach spin-lattice rate within the lowest Ce 3+ doublet due to direct spin-phonon transitions to the first excited Ce 3+ doublet. This rate is enhanced by three orders of magnitude compared with the Orbach spin-lattice rate of Ce 3+ diluted into the other rare-earth ethylsulfates. The susceptibility results also show that the Orbach spin-lattice rate is greater than any spin-spin relaxation rate for the lowest Ce 3+ doublet. This is the opposite of the usual case in concentrated paramagnetic salts.
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