Abstract
Recent measurements of the magnetic susceptibility and magnetic ordering of the rare earth phosphomolybdates, RPO4(MoO3)12·30H2O (or RPMO) are described. R denotes the trivalent ions Ce, Nd, Gd, Tb, Dy, Ho, Er, Tm, or Yb. Some data on iron and chromium phosphomolybdate is also included. The paramagnetic susceptibility data from 300 K to 0.1 K of the RPMO salts, with space group Fd¯3 (T4 h), is analyzed in terms of a crystal field Hamiltonian that assumes the magnetic ions have 23 (T) site symmetry, and estimates of the crystal field parameters are obtained. TbPMO and HoPMO have magnetic ground states due to mixing caused by the nuclear hyperfine interaction, and the data of HoPMO, in particular, can be fit rather well once the hyperfine interaction is included in the curves. Magnetic ordering was observed in FePMO, GdPMO, DyPMO, ErPMO and YbPMO. Exchange may be important in FePMO, but GdPMO, DyPMO, ErPMO and YbPMO are likely dipolar magnets. The susceptibilities of FePMO, DyPMO, ErPMO and YbPMO below T c are smaller than that predicted for a classical dipolar ground state. A diamond structure spin wave calculation shows qualitative agreement with these susceptibilities but not the quantitative agreement reported earlier. The susceptibility of GdPMO is higher than that predicted for a classical dipolar antiferromagnet, possibly indicating ferromagnetism. History dependence is observed in the susceptibility below the ordering features of GdPMO, DyPMO, and ErPMO, possibly indicating magnetic frustration.
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Van der Noordaa, J.T., Corruccini, L.R. Magnetic Properties of Rare Earth and Transition Metal Phosphomolybdates. Journal of Low Temperature Physics 121, 81–103 (2000). https://doi.org/10.1023/A:1026456526057
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DOI: https://doi.org/10.1023/A:1026456526057