TITLE

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

AUTHOR(S)
Jing Wu; Zhiming Huang; Yun Hou; Yanqing Gao; Junhao Chu
PUB. DATE
February 2010
SOURCE
Applied Physics Letters;Feb2010, Vol. 96 Issue 8, p082103
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
48352161

 

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