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Additional info for Magnetic Excitations and Fluctuations: Proceedings of an International Workshop, San Miniato, Italy, May 28 – June 1, 1984
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8. Lett. Phys. Lutie: Phys. Rev. A The Life Time of the Spin Waves of a Oassical Ferromagnetic Chain in an Applied Magnetic Field U. G. Pini Istituto di Elettronica Quantistica del CNR, 1-50127 Firenze, Italy v. Tognetti Dipartimento di Fisica dell'Universita, 1-50125 Firenze, Italy Gruppo Nazionale di Struttura della Materia del CNR 1. However,when the ordering effect of'the magnetic field overcomes the thermally induced disorder, the spin -wave approach can be successfully used and the non-perturbative treatment of the magnon interactions is found to remove typical one-dimensional divergences.
T:30 °OL-----J2------L4------L-----~8------L10----~1L2----~1~4----~16 magnetic field (kOej Fig. 4. Field dependence of the ESR frequencies in CHAC at T=2 K and HI/b. Circles are the expeY'imental data, drCMn;Zines are the calculated MER. the type of exchange anisotropy in CHACo Since no unique or complete theoretical description of the excitations in the present system exists, we will confront our data with several approximate theoretical models. e. transitions petween magnon bound-states, which up till now only have been observed in strongly Ising-like systems [12].
Stoll and U. ~v. J. Mikeska: J. Appl. Phys. J. Baxter: Ann. Phys. D. Johnson, S. M. McCoy:~ys. Rev. A. J. van Duyneveldt. M. P. D. Willett: Physica 106B, 47 (1981) K. C. M. de Jonge: Phys. Rev. B25, 4685 (1982) R. J. C. W. M. de Jonge, R. J. van Duyneveldt: J. Phys. B. Torrance and M. Tinkham: PhyS:-Rev. G. M. de Jonge:~ys. Rev. G. Gochev: JETP 34, 892 (1972) K. M. de Jonge: Phys. Rev. B29, 2868 (1984) Magnon-Phonon Coupling in Spin-l/2 Quasi lD Antiferromagnets D. J. Lockwood Division of Physics and Division of Microstructural Sciences National Research Council, Ottawa, K1A OR6, Canada Compounds possessing the CsNiCl 3 structure [1] have attracted considerable interest recently.