Abstract
We have grown a single crystal of PrRh 3 B 2 with the hexagonal structure and measured the electrical resistivity, specific heat, de Haas–van Alphen oscillation, magnetic susceptibility, high-field magnetization, thermal expansion and magnetostriction. PrRh 3 B 2 is not a simple ferromagnet as reported previously, but a ferrimagnet with an ordering temperature T ord =3.6 K. The Schottky specific heat observed around 25 K and the large anisotropy of the magnetic susceptibility and magnetization are found to be well explained by the crystalline electric field (CEF) with a large overall CEF-splitting energy of 1080 K and a strong ferromagnetic exchange interaction along the [0001] direction. The topology of the Fermi surface in PrRh 3 B 2 is similar to that of the non-4 f reference compound LaRh 3 B 2 , exhibiting a quasi-one-dimensional character of the electronic states.
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