On Thermo- and Photo-Induced Symmetry-Broken Transformation in Spin–Crossover Complex: Cooperative Activation

Autor:	Kenji Yonemitsu, Tadeusz Luty
Rok vydání:	2004
Předmět:	Physics Condensed matter physics Magnetism Dimer General Physics and Astronomy Activation energy Crystal structure Molecular physics chemistry.chemical_compound chemistry Spin crossover Phase (matter) Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Symmetry breaking
Zdroj:	Journal of the Physical Society of Japan. 73:1237-1243
ISSN:	1347-4073 0031-9015
Popis:	We study energetics of a cooperative low-spin (L) to high-spin (H) transformation in a crystal with two sublattices, where thermo- and photo-induced symmetry-broken phases have been recently observed. The model takes into account an intra-dimer antiferromatic coupling and inter-dimer couplings. Cooperative activation processes for switching between LH and HL states and that from LL to HH states of a dimer are analyzed. It is shown that locally (within a dimer) preferred symmetry-broken, LH and HL, states compete with inter-dimer couplings, which stimulates dynamical disorder via a decrease in the energy barrier for a flip between asymmetric configurations. On the other hand, a locally non-preferred symmetric state (HH) is supported by inter-dimer interaction via a cooperative activation mechanism. We conclude that symmetry-broken states can form an intermediate thermo-induced phase or can be observed as a photo-induced one at low temperatures as a result of local equilibrium. The global equilibrium follow...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::631ff5ed87aef97dc79affb27bd944ac https://doi.org/10.1143/jpsj.73.1237 Zobrazit plný text záznamu