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We report on the magnetic behavior of RRhB (R = La, Ce, Pr, Nd, Gd, Tb andTm) and RRhC (R = La, Ce, Pr and Gd) compounds crystallizing in the cubicperovskite type structure with space group Pm3m. The heat capacity data onPauli-paramagnetic LaRhB and LaRhC indicate a high frequency vibrating motionof boron and carbon atoms in the unit cell. Ce is in -like nonmagnetic state inboth the compounds. Pr compounds show a dominant crystal field effect with anonmagnetic singlet ground state in PrRhB and a nonmagnetic quadrupolar doubletin PrRhC. Compounds with other rare earths order ferromagnetically at lowtemperatures except TmRhB in which the zero field evolution of magneticinteractions is relatively more complicated. The electrical resistivity ofGdRhB decreases with increasing temperature in the paramagnetic state in thevicinity of T, which is rarely seen in ferromagnets. The behavior is discussedto be arising due to the short range spin fluctuation and a possiblecontribution from Fermi surface geometry.

Magnetic Behavior in RRhX (R = rare earths; X=B, C) Compounds