Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-11-07
Phys. Rev. Lett., 84 (2000) 5880
Physics
Condensed Matter
Strongly Correlated Electrons
Revtex, 4 pages, 4 figures, submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.84.5880
A new elementary-excitation, the so called "breather excitation", is observed directly by millimeter-submillimeter wave electron spin resonance (ESR) in the Heisenberg quantum spin-chain Cu benzoate, in which a field-induced gap is found recently by specific heat and neutron scattering measurements. Distinct anomalies were found in line width and in resonance field around the "dynamical crossover" regime between the gap-less spinon-regime and the gapped breather-regime. When the temperature becomes sufficiently lower than the energy gap, a new ESR-line with very narrow line-width is found, which is the manifestation of the breather excitation. The non-linear field dependence of the resonance field agrees well with the theoretical formula of the first breather-excitation proposed by Oshikawa and Affleck. The present work establishes experimentally for the first time that a sine-Gordon model is applicable to explain spin dynamics in a S=1/2 Heisenberg spin chain subjected to staggered field even in high fields.
Ajiro Yasuhiro
Asano Tetsuo
Boucher Jean-Paul
Inagaki Yuji
Motokawa Mitsuhiro
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