ELECTRON-SPIN-RESONANCE IN HYDROGENATED RBFES2

RbFeS//2 is a member of the alkali dithioferrate series of compounds. A magnetic phase transition was observed at T//c equals 185 K. In this letter we report ESR measurements in hydrogenated RbFeS//2 between 160 and 360 K. From the difference between two curves in the temperature range 160 to 200 K and the value of the transition temperature in non-hydrogenated RbFeS//2, the transition temperature of hydrogenated RbFeS//2 is estimated to be approximately 245 K. Hydrogenation thus increases the transition temperature of RbFeS//2 by about 60 K.