Abstract
The effect of Mo doping on the structural, magnetic, electrical, and thermal transport properties of Ca4Mn3�xMoxO10 0x 0.3 compounds has been investigated. Our study indicates that Ca4Mn3O10 exhibits a weak ferromagnetism below TN = 115 K, which is due to the canting of antiferromagnetic sublattices. The slight Mo doping at Mn sites for x = 0.03, 0.06, and 0.1 induces ferromagnetic clusters. The induced ferromagnetism may be ascribed to the double-exchange DE interaction between Mn 4+ and Mn 3+ ions. For the x = 0.2 and 0.3 samples, experimental results show that a cluster-glass state dominates at low temperatures due to the competition between the ferromagnetic DE and the antiferromagnetic superexchange interactions. The small polaron hopping and variable range hopping mechanisms have been used to explain the conduction behavior of these samples. Under 7 T field and at 50 K, the maximum magnetoresistance value 45% is observed in the x = 0.1 sample. The observed negative thermopower S values indicate that the carriers present in all the samples are electrons. Furthermore, the thermal conductivity measurement results show the enhanced Jahn-Teller distortions of MnO6 octahedra and quenched structural disorder due to Mo doping.
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