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Charge ordering and spin frustration in AlV2-x CrxO4
K Matsuno1, T Katsufuji, S Mori
1Department of Advanced Materials Science, University of Tokyo, Tokyo 113-8656, Japan.
Abstract:
The relationship between charge and spin degrees of freedom in a geometrically frustrated system, AlV2-xCrxO4 spinel, is investigated. Upon Cr doping, the charge-ordered phase of AlV2O4 is rapidly suppressed and a charge-disordered phase grows up instead. It is found that the magnetic ground state is a spin-glass state dominated by geometrical frustration for both phases, but larger spin entropy remains down to low temperatures in the charge-ordered phase, possibly owing to its two-dimensional character.
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