Soft Phonons and Structural Phase Transitions in La1.875Ba0.125CuO4

Phonons and Phase Transitions in Finite Nuclei

The nature and evolution of collectivity and coherence in nuclei is one of the most fundamental issues in nuclear structure and its evolution with N and Z. Despite many experiments, the nature of nuclear vibrational modes in deformed nuclei and the nature of nuclear phase/shape transitions are not at all understood. We discuss new experiments on phonon and multi-phonon states in the rare earth ...

Phase Transitions in Soft Topographic

We have developed an algorithm (STVQ) for the optimization of neighborhood preserving maps by applying deterministic anneal-ing to an energy function for topographic vector quantization. The com-binatorial optimization problem is solved by introducing temperature dependent fuzzy assignments of data points to cluster centers and applying an EM-type algorithm at each temperature while annealing. ...

Structural phase transitions

Structural phase transitions can be studied by a variety of techniques; macroscopic fields, X-ray, light and neutron diffraction, and resonance methods. The information which can be obtained by these different techniques about the order parameter and susceptibility at structural phase transitions is described and compared. Landau theory coupled with the 'sot~ mode' concept provides a simple pic...

Structural Phase Transitions in Ag2Se (Naumannite)

Structural phase transitions in multipole traps