Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf
1 PublikationField-Induced Gap in Quantum Spin-1/2 Chains in Strong Magnetic Fields
Zvyagin, S. A.; Ozerov, M.; Wosnitza, J.; Cizmar, E.; Feyerherm, R.; Manmana, S. R.; Mila, F.
Abstract
The low-temperature excitation spectrum in copper pyrimidine dinitrate, a spin-1/2 antiferromagnetic chain with alternating g-tensor and Dzyaloshinskii-Moriya interactions that exhibits a eld-induced spin gap, is probed by means of ESR spectroscopy in magnetic elds up to 63 T. In particular, we report on a minimum of the gap in the vicinity of the saturation field Hsat = 48:5 T associated with a transition from the sine-Gordon region (with soliton-breather elementary excitations) to a spin-polarized state (with magnon excitations). This interpretation is fully conrmed by the quantitative agreement over the entire eld range of the experimental data with the DMRG calculations for spin-1/2 Heisenberg chain with a staggered transverse field.
This work was partly supported by the DFG and EuroMagNET II under the EU contract 228043.
Beteiligte Forschungsanlagen
- Hochfeld-Magnetlabor (HLD)
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Poster
26th International Conference on Low Temperature Physics, 10.-17.08.2011, Beijing, China
Permalink: https://www.hzdr.de/publications/Publ-16181