Thermodynamic Properties and Elementary Excitations in Quantum Sine-Gordon Spin System KCuGaF6

Details Thermodynamic Properties and Elementary Excitations in Quantum Sine-Gordon Spin System KCuGaF6 Thermodynamic Properties and Elementary Excitations in Quantum Sine-Gordon Spin System KCuGaF6

2007-03-26

arxiv.org/abs/cond-mat/0703671v3

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, to appear in J. Phys. Soc. Jpn., vol. 76, no. 6

Scientific paper

10.1143/JPSJ.76.063706

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.

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