Quasi-universal finite-$T$ scaling in gapped one-dimensional quantum magnets

Details Quasi-universal finite-$T$ scaling in gapped one-dimensional quantum magnets Quasi-universal finite-$T$ scaling in gapped one-dimensional quantum magnets

2007-11-26

arxiv.org/abs/0711.4094v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, accepted to PRL

Scientific paper

Temperature dependencies of gap energies and magnon lifetimes are measured in the quasi-1-dimensional S=1/2 gapped quantum magnets IPA-CuCl3 and Sul-Cu2Cl4 using inelastic neutron scattering. The results are compared to those found in literature for S=1 Haldane spin chain materials and to theoretical calculations for the O(3)- and O(N)- quantum non-linear sigma-models. It is found that when the T=0 energy gap Delta is used as the temperature scale, all experimental and theoretical curves are identical to within system-dependent but temperature-independent scaling factors of the order of unity. This quasi-universality extends over a surprising broad T range, at least up to kappa T ~ 1.5 Delta.

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