Abstract
We investigated the substitution effects of Mg2+, Ca2+, and Al3+ for Cr3+ on the magnetic, transport and thermal properties of delafossite oxide CuCrO2, which possesses a quasi-2D Heisenberg triangular antiferromagnetic (AF) lattice. Magnetization and specific heat measurements indicated that AF ordering is promoted by the substitution of nonmagnetic Mg2+ for Cr3+ (S = 3/2), despite the fact that a spin vacancy is introduced in a 120° spin structure at the Cr sites. These results suggest that the residual magnetic frustration is partially broken by spin fluctuations, which are enhanced through the interaction between the itinerant hole introduced by Mg doping and the localized spin at the Cr site.
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