Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet

Abstract

Using inelastic magnetic neutron scattering we have discovered a localized spin resonance at 4.5 meV in the ordered phase of the geometrically frustrated cubic antiferromagnet $\mathrm{ZnC}{\mathrm{r}}_2{\mathrm{O}}_4$. The resonance develops abruptly from quantum critical fluctuations upon cooling through a first order transition to a co-planar antiferromagnet at $T_c=12.5(5)$ K. We argue that this transition is a three dimensional analogue of the spin-Peierls transition.

4 figures, revised and accepted in Phys. Rev. Lett

References in corpus (1)

• Transition to Long Range Magnetic Order in the Highly Frustrated Insulating Pyrochlore Antiferromagnet Gd_2Ti_2O_7

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