Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-06-09
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 6 figures, Phys. Rev. B 74, in press
Scientific paper
The nature of the magnetic transition of the half-filled triangular antiferromagnet Ag$_{2}$NiO$_2$ with $T_{\rm N}$=56K was studied with positive muon-spin-rotation and relaxation ($\mu^+$SR) spectroscopy. Zero field $\mu^+$SR measurements indicate the existence of a static internal magnetic field at temperatures below $T_{\rm N}$. Two components with slightly different precession frequencies and wide internal-field distributions suggest the formation of an incommensurate antiferromagnetic order below 56 K. This implies that the antifrerromagnetic interaction is predominant in the NiO$_2$ plane in contrast to the case of the related compound NaNiO$_2$. An additional transition was found at $\sim$22 K by both $\mu^+$SR and susceptibility measurements. It was also clarified that the transition at $\sim$260 K observed in the susceptibility of Ag$_{2}$NiO$_{2}$ is induced by a purely structural transition.
Ansaldo Eduardo J.
Brewer Jess H.
Chow Kim H.
Hiroi Zenji
Ikedo Yutaka
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