تقرير
Elementary excitations and specific heat in quantum sine-Gordon spin chain KCuGaF6
| العنوان: | Elementary excitations and specific heat in quantum sine-Gordon spin chain KCuGaF6 |
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| المؤلفون: | Umegaki, I., Ono, T., Tanaka, H., Oshikawa, M., Nojiri, H. |
| سنة النشر: | 2010 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | 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. Comment: 7 pages, 9 figures, to appear in Physica E (proceedings of International Symposium on Nanoscience and Quantum Physics nanoPHYS'09) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.physe.2010.07.042 |
| URL الوصول: | http://arxiv.org/abs/1007.1304 |
| رقم الأكسشن: | edsarx.1007.1304 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.physe.2010.07.042 |
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