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Abstract:
We report magnetization and magnetoresistance studies of the
geometrically frustrated spinel compound LiMn2O4 near its charge
ordering temperature. The effect of a 7 T magnetic field is to very
slightly shift the transition in the resistivity to lower temperatures
resulting in large negative magnetoresistance with significant
hysteresis. This hysteresis is not reflected in the magnetization. These
observations are compared with what is found in the colossal
magnetoresistance and charge ordering perovskite manganese oxides. The
manner in which geometric frustration influences the coupling of charge
and spin degrees of freedom is examined.
