MAGNETIC-PROPERTIES OF (Y,ER)BA2CO3O8

The (Y,Er)Ba2Co3O8 compounds crystallize in a cubic perovskite-type (a =4.134A degrees) structure. DC magnetic susceptibility and Mossbauer-s pectroscopy (MS) on Fe-57 doped materials, show that the Co sublattice does not order magnetically down to 1.5 K. MS reveal two inequivalent Co sites. Specific-heat and susceptibility studies show that Er in Er Ba2Co3O8 orders magnetically at 3.2 K. The Cp(T) at H=0 T curves indic ate a significant high electronic linear term of gamma similar to 200 mJ/mol K2.