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    Local Spin Resonance and Spin-Peierls-like Phase Transition in a Geometrically Frustrated Antiferromagnet

Local Spin Resonance and Spin-Peierls-like Phase Transition in a Geometrically Frustrated Antiferromagnet

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Using inelastic magnetic neutron scattering we have discoverd a localized spin resonance at 4.5 meV in the ordered phase of the geometrically frustrated cubic antiferromagnet Zn Cr sub 2 O 4. The resonance develops abruptly from quantum critical fluctuations upon cooling through a first order transition to a co-planar antiferromagnet at T sub c = 12.5(5) K. We argue that this transition is a three-dimensional analogue of the spin-Peierls transition.