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Lattice multi‐stability in low‐dimensional structures
Author(s) -
Radosz A.,
Ostasiewicz K.,
Magnuszewski P.,
Radosiński Ł.,
Kusmartsev F. V.,
Samson J. H.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200460048
Subject(s) - asymmetry , limiting , lattice (music) , ground state , entropy (arrow of time) , statistical physics , quantum , phase transition , physics , chemical physics , condensed matter physics , quantum mechanics , mechanical engineering , acoustics , engineering
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)