Local spin resonance and spin-peierls-like phase transition in a geometrically frustrated antiferromagnet |
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| Authors: | Lee Broholm Kim Ratcliff Cheong |
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| Institution: | University of Maryland, College Park, Maryland 20742 and NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. |
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| Abstract: | Inelastic magnetic neutron scattering reveals a localized spin resonance at 4.5 meV in the ordered phase of the geometrically frustrated cubic antiferromagnet ZnCr2O4. 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 analog of the spin-Peierls transition. |
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