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Effect of spin dilution on the magnetic state of delafossite CuCrO$$_{2}$$ with an $$S$$ = 3/2 antiferromagnetic triangular sublattice

Okuda, Tetsuji*; Uto, Kazuma*; Seki, Shinichiro*; Onose, Yoshinori*; Tokura, Yoshinori*; Kajimoto, Ryoichi  ; Matsuda, Masaaki*

We investigated an effect of spin dilution on the magnetic and thermal properties of delafossite CuCrO$$_{2}$$ having an $$S$$ = 3/2 antiferromagnetic triangular lattice (ATL) by the substitution of Al$$^{3+}$$ for Cr$$^{3+}$$ by measurements of magnetization, specific heat, and neutron scattering. Spin defects introduced into Cr ATL layers blur the antiferromagnetic transition and induce a dimensional crossover of low-energy magnetic excitation in the residual Cr ATL region due to the reduction of inter-layer magnetic interaction, while accompanying an enhancement of a spin-glass component. The observed $$T^{2}$$ contribution to the low-$$T$$ $$C_mathrm{mag}$$ above $$y$$ = 0.15, as well as in Cu$$_{0.85}$$Ag$$_{0.15}$$CrO$$_{2}$$, comes mainly from a short-range 2D AF excitation originating in a nontrivial magnetic state such as spin-nematic or spin-liquid states.

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Category:Physics, Multidisciplinary

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