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

S. -H. Lee; C. Broholm; T. H. Kim; W. Ratcliff; S-W. Cheong

doi:10.1103/PhysRevLett.84.3718

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

Strongly Correlated Electrons 2009-10-31 v2

Authors: S. -H. Lee , C. Broholm , T. H. Kim , W. Ratcliff , S-W. Cheong

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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 $\rm ZnCr_2O_4$ . 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.

Keywords

spin resonance geometrically frustrated antiferromagnet spin-Peierls transition ZnCr2O4 quantum critical fluctuations

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@article{arxiv.cond-mat/9908433,
  title  = {Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet},
  author = {S. -H. Lee and C. Broholm and T. H. Kim and W. Ratcliff and S-W. Cheong},
  journal= {arXiv preprint arXiv:cond-mat/9908433},
  year   = {2009}
}

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

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

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