Complex ferromagnetic-antiferromagnetic phase transition and glass-like arrest of kinetics in Sm_(1-x)Ba_xCrO_3 (x = 0 and 0.1)

摘要

The dc magnetization studies of polycrystalline sample Sm_(1-x)Ba_xCrO_3 (x = 0 and 0.1) show the existence of a magnetic glass-like arrest of kinetics. There exist constant frozen fractions of antiferromagnetic state in this complex phase transition process, the frozen fractions are about 33% and 17%, respectively, in SmCrO_3 and Sm_(0.9)Ba_(0.1)CrO_3 at the cooling and warming rates of 1.5K/min. The degree of ferromagnetic-antiferromagnetic (FM-AFM) phase transitions is closely corresponding to the kinetic behaviors and thermomagnetic irreversibility. The FM-AFM phase transition and the frozen AFM fractions jointly affect the kinetics of glassy behaviors. The magnetic phase transition and glassy state was gradually repressed with the increase of the applied magnetic field, this complex behavior could be tuned in a number of ways in a two parameter (T and H) phase space.