Unconventional spin fluctuations in the hexagonal antiferromagnet YMnO${}_3$

T. J. Sato, S. -H. Lee, T. Katsufuji +4

We used inelastic neutron scattering to show that well below its Néel temperature, $T_{\mathrm{N}}$, the two-dimensional (2D) XY nearly-triangular antiferromagnet YMnO${}_3$ has a promi…