Titlebook: Magnetic Excitations and Fluctuations II; Proceedings of an In Umberto Balucani,Stephen W. Lovesey,Valerio Tognet Conference proceedings 19

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Modular Invariance and Two-Dimensional Critical Systemsl) scale invariance follows from the work of Belavin Polyakov and Zamolodchikov coming after numerous studies on finite size scaling. These authors applied the techniques developed in the framework of string theories to the study of two dimensional statistical systems, with a prominent role played b

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Phase Transitions in Ising Superlatticesnterest and activity in the creation and understanding of artificial layered structures. To date work has focused largely on metals and semiconductors and the obvious importance of controlled electronic properties. But there is much to be learned from insulating magnetic superlattices, as well, and

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Calculation of Static Magnetic Susceptibilities of a Jahn-Teller ,Doublete of coupling to harmonic modes there is a pronounced dynamic Jahn-Teller effect on the static susceptibilities of the orbital state, e.g. at low temperatures the static magnetic susceptibility is substantially reduced, and approaches asymptotically a Curie-like behavior only at higher temperatures.

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Random-Exchange and Random-Field , Chain for ,=1/2still disputed [1]. Adopting a quantum statistical point of view, the universal features are hidden in the density of states and the localization properties of the wave functions. In this work, we investigate density of states and localization length of wave functions in an s = ½ xy-chain for random

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Harmonic Magnons in Spin Glasses: Cd0.35Mn0.65Teor which samples can be prepared, x<0.7. Originally, it was believed there was a phase boundary at x=0.6 separating the spin glass phase from an antiferromagnetic phase and a second boundary at x=0.2 separating the spin glass phase from a paramagnetic phase. However, recent neutron scattering measur

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On a Symmetric (2,+1)-State System Coupled to Its Environment: Tunneling Splitting and Quantum Coher. and. (1a). (1b). (1C)where Sα is the α-component of the spin operator with magnitude S, and D and A are assumed to be positive. The environment H. is assumed to be described by a heat bath composed of an ensemble of bosons with characteristic energies .. The coupling between the systems is denoted