Titlebook: Dynamical Properties of Unconventional Magnetic Systems; Arne T. Skjeltorp (director),David Sherrington Book 1998 Springer Science+Busines

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Quantum Critical Points-Experiments,We review experiments on Li(Ho,Tb).Y.F. which test ideas about quantum critical phenomena in the clean (ferromagnetic) and disordered (spin glass) limits. The outstanding problem of the ‘anti-glass’ discovered for p=0.045 is also described. Finally, we point out the ubiquity of quantum critical points in condensed matter physics.

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Soliton Confinement and the Excitation Spectrum of Spin-Peierls Antiferromagnets,The excitation spectrum of spin-Peierls antiferromagnets is discussed taking into acount phonon dynamics but treating inter-chain elastic couplings in mean field theory. This gives a ladder of soliton-anti-soliton boundstates, with no soliton continuum, until soliton deconfinement takes place at a transition into a non-dimerized phase.

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The Excitations of One-Dimensional Spin 1/2 Antiferromagnets,main walls. CsGeO. is an example of a spin-Peierls system in which the coupling to the lattice causes a alternation of the exchange constants and the ground state becomes a non-magnetic dimer state. The excitations are then long lived but different from spin waves and best described as the triplet e

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Spin Spectroscopy and Coherence in Magnetic Quantum Structures,ation and for new generations of magneto-electronic devices [5,6]. In this chapter, we focus on experiments that probe the fundamental spin dynamical properties of a low dimensional (i.e. d < 3) electron or exciton gas that is strongly exchange coupled to a controlled distribution of local moments.

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