Lattice multi-stability in low-dimensional structures

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 transfe...

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Bibliographic Details
Published in:Physica Status Solidi (b) 2005-02, Vol.242 (2), p.303-310
Main Authors: Radosz, A., Ostasiewicz, K., Magnuszewski, P., Radosiński, Ł., Kusmartsev, F. V., Samson, J. H.
Format: Article
Language:English
Subjects:
64.60.My
65.40.Ba
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Thermal properties of condensed matter
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Summary: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. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.200460048