Abstract
The magnetism of a metallic two-dimensional triangular antiferromagnetic (AF) compound, Ag${}_{2}$CrO${}_{2}$, has been investigated by muon-spin rotation and relaxation (${\ensuremath{\mu}}^{+}$SR) using a powder sample in the temperature range between 1.8 and 40 K. Below ${T}_{\mathrm{N}}=24$ K, a muon-spin precession signal was clearly observed in the zero-field spectrum, indicating the formation of static AF order. It was also found that the internal field is temperature independent except for in the vicinity of ${T}_{\mathrm{N}}$, as in the case for the susceptibility versus temperature curve. This suggests that the AF transition is induced by a first-order structural phase transition at ${T}_{\mathrm{N}}$. Combining the ${\ensuremath{\mu}}^{+}$SR result with the prediction for muon sites in the lattice by first-principles calculations, a partially disordered AF state was found to be the most reasonable spin structure for Ag${}_{2}$CrO${}_{2}$.
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