Extended universal finite-T renormalization of excitations in a class of one-dimensional quantum magnets
- Authors
- Zheludev, A.; Garlea, V.O.; Regnault, L.-P.; Manaka, H.; Tsvelik, A.; Chung, J.-H.
- Issue Date
- 2008
- Citation
- Physical Review Letters, v.100, no.15
- Indexed
- SCOPUS
- Journal Title
- Physical Review Letters
- Volume
- 100
- Number
- 15
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/125302
- DOI
- 10.1103/PhysRevLett.100.157204
- ISSN
- 0031-9007
- Abstract
- Temperature dependencies of gap energies and magnon lifetimes are measured in the quasi-one-dimensional S=1/2 gapped quantum magnets (CH3)2CHNH3CuCL3 (IPA-CuCl3, where IPA denotes isopropyl ammonium) and Cu2Cl4•D8C4SO2 (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 nonlinear σ-models. It is found that when the T=0 energy gap Δ 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 κT∼1.5Δ. © 2008 The American Physical Society.
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