Field-Induced Gap in a Quantum Spin-1/2 Chain in a Strong Magnetic Field

Details 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

2010-10-29

arxiv.org/abs/1010.6141v1

Phys. Rev. B 83, 060409(R), 2011

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.83.060409

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 pulsed-field electron spin resonance spectroscopy. In particular, we report on a minimum of the gap in the vicinity of the saturation field $H_{sat}=48.5$ 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 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.

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