Field-Induced Gap in a Quantum Spin-1/2 Chain in a Strong Magnetic Field
Field-Induced Gap in a Quantum Spin-1/2 Chain in a Strong Magnetic Field
Zvyagin, S.; Ozerov, M.; Wosnitza, J.; Cizmar, E.; Feyerherm, R.; Manmana, S. R.; Mila, F.
Abstract
Magnetic excitations in copper pyrimidine dinitrate, a spin-1/2 antiferromagnetic chain with alternating g-tensor and Dzyaloshinskii-Moriya interactions that exhibits a field-induced spin gap, are probed by means of pulsedfield electron spin resonance spectroscopy. 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 solitonbreather elementary excitations) to a spin-polarized state (with magnon excitations). This interpretation is fully confirmed by the quantitative agreement over the entire field range of the experimental data with the DMRG investigation of the spin-1/2 Heisenberg chain with a staggered transverse field.
Involved research facilities
- High Magnetic Field Laboratory (HLD)
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Lecture (Conference)
MAR11 Meeting of The American Physical Society, 21.-25.03.2011, Dallas, Texas, USA
Permalink: https://www.hzdr.de/publications/Publ-15478