Abstract
Hexagonal crystals of rare earth trifluoromethanesulfonate nonahydrates R(CF3SO3)3·9H2O, RTFMS are similar in structure to the rare earth ethylsulfate nonahydrates RES. χ|| and χ⊥ measured between 0.06 and 20K show RTFMS salts with R = Tb, Dy and Ho to be dipolar ferromagnets ordering at 0.24K, 0.111K and 0.224K, respectively, as do the corresponding RES compounds. Like CeES, CeTFMS remains paramagnetic but their Ce3+ level splittings are different. PrTFMS exhibits antiferromagnetic long-range order below TN≈0.31K while PrES shows only short- range one dimensional order. Measurements of Cp for TbTFMS and PrTFMS confirm their phase transitions.
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