Elementary excitations and specific heat in quantum sine-Gordon spin chain KCuGaF6

Details Elementary excitations and specific heat in quantum sine-Gordon spin chain KCuGaF6 Elementary excitations and specific heat in quantum sine-Gordon spin chain KCuGaF6

2010-07-08

arxiv.org/abs/1007.1304v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 9 figures, to appear in Physica E (proceedings of International Symposium on Nanoscience and Quantum Physics nanoPHYS

Scientific paper

Elementary excitations of an S = 1/2 antiferromagnetic Heisenberg chain KCuGaF6 were investigated through specific heat and electron spin resonance (ESR) measurements. In this compound, a staggered field is induced perpendicular to the external field because of the alternating g tensor and the Dzyaloshinsky-Moriya interaction with an alternating D vector. Such a spin system can be mapped onto the quantum sine-Gordon (SG) model, when subjected to the external magnetic field. Specific heat shows clear evidence of the field-induced gap, which is related to the elementary excitations, solitons and breathers, characteristic of the quantum SG model. q = 0 excitations originated from solitons and breathers were directly observed by high-frequency high-field ESR. These experimental results are well described by the quantum SG field theory.

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