Mo-Doping Effect in CaRuO₃

Mo-Doping Effect in CaRuO₃

The magnetic and the transport properties of polycrystalline CaRu1-xMoxO₃(x = 0 and 0.02) have been studied. For CaRuO₃, the M(T) curves in the zero-field-cooling and the field-cooling modes are divided below 12.7 K, exhibiting the character of a spin glass state, which includes the coexistence of short-range ferromagnetic (FM) and antiferromagnetic (AFM) interactions. The FM interaction begins to take place at temperatures above 15 K while the AFM one exists only at temperatures below 12.7 K. The doping of Mo ions hardly affects the AFM interaction, but enhances the FM one. The temperature-dependent resistivity, ρ(T), curves of CaRuO₃ show a metallic conductivity in the high-temperature region and an insulating state at low temperaures, but the value of the resistivity is small in the whole temperature region. CaRu0.98 Mo0.02O₃ reveals an insulating behavior over the investigated temperature range. The doping of Mo ions enhances the insulating properties. According to the variable-range hopping model, the electrons become more localized with increased doping of Mo ions

The magnetic and the transport properties of polycrystalline CaRu1-xMoxO₃(x = 0 and 0.02) have been studied. For CaRuO₃, the M(T) curves in the zero-field-cooling and the field-cooling modes are divided below 12.7 K, exhibiting the character of a spin glass state, which includes the coexistence of short-range ferromagnetic (FM) and antiferromagnetic (AFM) interactions. The FM interaction begins to take place at temperatures above 15 K while the AFM one exists only at temperatures below 12.7 K. The doping of Mo ions hardly affects the AFM interaction, but enhances the FM one. The temperature-dependent resistivity, ρ(T), curves of CaRuO₃ show a metallic conductivity in the high-temperature region and an insulating state at low temperaures, but the value of the resistivity is small in the whole temperature region. CaRu0.98 Mo0.02O₃ reveals an insulating behavior over the investigated temperature range. The doping of Mo ions enhances the insulating properties. According to the variable-range hopping model, the electrons become more localized with increased doping of Mo ions