Titlebook: Magnetic Excitations and Fluctuations; Proceedings of an In Stephen W. Lovesey,Umberto Balucani,Valerio Tognet Conference proceedings 1984

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Solitons in a , (,=1/2) Quantum Systemy discovered system (C.H.NH.)CuBr.. We have measured the excess specific heat △C, the nuclear spin-lattice relaxation (NSLR) time T. in the field range 0 < B < 7 k0e and the temperature range 1.5 K < T < 10 K, although some data are also obtained outside this region. These data will show that both t

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The Life Time of the Spin Waves of a Classical Ferromagnetic Chain in an Applied Magnetic Fieldtion often requires the use of non-perturbative approaches [1], [2].The concept of non-linear excitations (solitons) was also sometimes invoked [3].However,when the ordering effect of`the magnetic field overcomes the thermally induced disorder, the spin -wave approach can be successfully used and th

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Quantum Spin Chains: Phase Behaviour and Dynamic Excitationseresting conjecture of HALDANE [1]. According to Haldane, half-integer spin chains should behave like the exactly solvable spin-1/2 XXZ model, with a gapless phase for planar anisotropy terminating at an essential singularity at the Heisenberg point, and a phase with long-range order in the ground s

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Field Dependent Spin Dynamics of Antiferromagnetic Heisenberg Chainses. These techniques include soliton theories in the presence of weak magnetic fields [1], perturbative studies of a generalized Langevin equation for intermediate and large fields [2, 3] and computer simulations [4]. Here we calculate, using a new mode-coupling theory, the response function measure

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Is CsNiF3 a Classical System?oximated (in the continuum limit and for D→∞) by the sine-Gordon (SG) model[1]. However, much experimental data [2] on CsNiF., a compound well described by (1), addressed to estimating the contribution of non-linear modes to the thermodynamic and scattering properties,have not received a consistent