Soft modes and structural phase transitions in La2CuO4

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...

Quantum Phase Transitions and Collective Modes in d-wave Superconductors

Fluctuations near second-order quantum phase transitions in d-wave superconductors can cause strong damping of fermionic excitations, as observed in photoemission experiments. The damping of the gapless nodal quasiparticles can arise naturally in the quantum-critical region of a transition with an additional spin-singlet, zero momentum order parameter; we argue that the transition to a dx2−y2 +...

Structural Phase Transitions in Ag2Se (Naumannite)

Structural phase transitions in multipole traps