Variation in hopping conduction across the magnetic transition in spinel Mn1.56Co0.96Ni0.48O4 films

Jing Wu; Zhiming Huang; Yun Hou; Yanqing Gao; Junhao Chu
February 2010
Applied Physics Letters;Feb2010, Vol. 96 Issue 8, p082103
Academic Journal
The temperature dependent dc resistivity of spinel Mn1.56Co0.96Ni0.48O4 (MCN) films is measured in the range of 130–304 K. The hopping exponent p of small polaron hopping conduction shows a clear variation from a value of 0.46 in the paramagnetic to 0.91 in the ferromagnetic phase. In order to explain such variation, a model is proposed where Gaussian distributed localized electron states gradually withdraw from the Hubbard band gap below the magnetic transition as a result of increased magnetic order. This correlation between hopping conduction and magnetic order in MCN films may provide a possible approach to fabricate the devices which couple magnetic and electronic properties in one unit.


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