Abstract
Electrical resistivity ρ, magnetization M and specific heat C are reported for polycrystalline samples of the hexagonal system PrRh3. The magnetic susceptibility M/B obeys the Curie-Weiss law with the effective magnetic moment μeff = 3.88 μB/Pr and the paramagnetic Curie temperature θp = +2.9K, which indicates ferro-type magnetic interaction between the trivalent Pr ions. A cusp in C(T) at 3.0K coincides with a bend in ρ(T). Applying magnetic fields, the peak broadens and shifts to higher temperatures. The field dependence indicates a ferro-type magnetic order. The magnetic entropy Sm is (1/3)Rln2 at TC = 3.0K, suggesting that part of the Pr ions take part in the magnetic order. A broad tail of the magnetic specific heat Cm observed above TC may result from short-range correlations and/or fluctuations of the active magnetic dipole and quadrupoles in the ground state doublet.
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