Abstract
Dimensional crossover from anisotropic-three-dimensional (3D) to 2D low-energy magnetic excitations was found in delafossite oxide Cu 1- x Ag x CrO 2 having a spin-3/2 antiferromagnetic (AF) triangular lattice. The crossover is evidenced by a decrease in AF transition temperature ( T N ), distinct 2D magnetic excitations above T N for Cu 0.85 Ag 0.15 CrO 2 , a disappearance of a peak of magnetic specific heat ( C mag ) around T N , and a successive change from T 3 to T 2 dependence of low- T C mag accompanying a low- T shift of magnetic entropy. These results may suggest a gradual change from AF to spin-liquid like states with an increase in x .
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