Abstract
The ground state of an electronic system of compounds revealing photo-induced phase transitions might be regarded as a multiple-well, on-site potential. Different types of asymmetric, multi-stable potentials correspond to compounds of different types: to spin conversion systems and to charge transfer systems. Thermodynamic properties of one-dimensional lattice systems with an asymmetric on-site double well and triple well potential are then considered in quantum and classical approaches. Studying a variety of regimes, one finds that the key feature is a level of asymmetry distinguished as a "shift type" and "shape type" in limiting cases. Nearly singular behaviour of heat capacity in "shape type" systems indicates an entropy driven phase transformation.
Original language | British English |
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Pages (from-to) | 303-310 |
Number of pages | 8 |
Journal | Physica Status Solidi (B) Basic Research |
Volume | 242 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2005 |