Abstract
A study of magnetic properties in the insulating spinel ${\mathrm{ZnCr}}_{1.6}$${\mathrm{Ga}}_{0.4}$${\mathrm{O}}_{4}$ (chromium ions in octahedral sites) has been made by carrying out low-field dc- and ac-susceptibility measurements as well as neutron diffraction, M\"ossbauer, and EPR experiments, which all give evidence of spin-glass-like behavior. The topological frustration, connected with the high ground-state degeneracy of the antiferromagnetic spinel octahedral sublattice, is the origin of the spin-glass ordering. Strong nearest-neighbor antiferromagnetic interactions are dominant in the system, leading to short-range magnetic order which appears at temperatures much higher than the freezing temperature defined by the acsusceptibility cusp [$T(\ensuremath{\nu}=17 \mathrm{Hz})=2.50$ K is frequency dependent]. The thermoremanent magnetization does not vanish at ${T}_{f}$, suggesting the existence of uncompensated clusters blocked above ${T}_{f}$. A paramagnetic behavior is observed below $T=1$ K, providing evidence for the presence of unfrozen spins below ${T}_{f}$ (entropic clusters).
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