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

Details 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

1999-08-29

arxiv.org/abs/cond-mat/9908433v2

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevLett.84.3718

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.

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