Abstract
Thermodynamic properties and elementary excitations in S =1/2 one-dimensional Heisenberg antiferromagnet KCuGaF 6 were investigated by magnetic susceptibility, specific heat and ESR measurements. Due to the Dzyaloshinsky–Moriya interaction with alternating D -vectors and/or the staggered g -tensor, the staggered magnetic field is induced when subjected to external magnetic field. Specific heat in magnetic field clearly shows the formation of excitation gap, which is attributed to the staggered magnetic field. The specific heat data was analyzed on the basis of the quantum sine-Gordon (SG) model. We observed many ESR modes including one soliton and three breather excitations characteristic of the quantum SG model.
Highlights
Thermodynamic properties and elementary excitations in S 1⁄4 1=2 one-dimensional Heisenberg antiferromagnet KCuGaF6 were investigated by magnetic susceptibility, specific heat and ESR
Specific heat in magnetic field clearly shows the formation of excitation gap, which is attributed to the staggered magnetic field
For S 1⁄4 1=2 uniform antiferromagnetic Heisenberg chain (AFHC), the ground state, thermodynamic properties and magnetic excitations are well understood with the help of exact solutions1–4) and accurate analytical and numerical calculations.5–8) These theoretical results demonstrate the importance of the quantum fluctuation characteristic of low-dimensional systems
Summary
Thermodynamic Properties and Elementary Excitations in Quantum Sine-Gordon Spin System KCuGaF6. Thermodynamic properties and elementary excitations in S 1⁄4 1=2 one-dimensional Heisenberg antiferromagnet KCuGaF6 were investigated by magnetic susceptibility, specific heat and ESR measurements. Specific heat in magnetic field clearly shows the formation of excitation gap, which is attributed to the staggered magnetic field. The specific heat data was analyzed on the basis of the quantum sine-Gordon (SG) model. For S 1⁄4 1=2 uniform AFHC, the ground state, thermodynamic properties and magnetic excitations are well understood with the help of exact solutions1–4) and accurate analytical and numerical calculations.5–8) These theoretical results demonstrate the importance of the quantum fluctuation characteristic of low-dimensional systems. The physics of S 1⁄4 1=2 AFHC in staggered magnetic field induced by the external magnetic field has been attracting considerable attention.9,10) The model
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