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Non magnetic insulators/semiconductors with induced magnetism introduced viatransition metal substitution are one of the promising materials in the fieldof spintronic, magnetoelectronics and magneto optical devices. In this context,here, we focus on magnetism induced in a non magnetic insulator CaHfO3, by thesubstitution of 4d element Ru, at Hf site. Structural investigations indicatethat substitution of Ru4+ (up to 50%) does not affect the original crystalstructure of the parent compound. Magnetic studies divulge a crossover from adiamagnetic to paramagnetic state with 20% Ru substitution. Further replacementof Hf results in a glassy magnetic state in CaHf1-xRuxO3 (0.3 < x < 0.5). Thenature of the low temperature glassiness (below 20 K) in these compositions isconfirmed through Vogel Fulcher and Power law, along with, magnetic memoryeffect and relaxation dynamics. The observed glassiness is explained throughthe phenomenological hierarchical model. Our studies indicate that the presenceof competing short range interactions among randomly arranged Ru cations in nonmagnetic insulator CaHfO3 are responsible for the observed low temperaturemagnetic state in this series with compositions > 0.25.

Emergence of low temperature glassy dynamics in Ru substituted non magnetic insulator CaHfO3