Issue 41, 2010

Spin crossover in an elastic chain of exchange clusters beyond mean field approximation

Abstract

Exact analysis of spin crossover in infinite elastic chain of two-spin exchange clusters was performed theoretically beyond mean-field approximation. Statistical mechanics of the system was exactly calculated by means of the transfer matrix technique. A possibility of spin-Peierls-like magneto-structural transition in a one-dimensional chain was shown as a result of interrelation of spin and elastic subsystems of the chain. The importance of the boundary conditions for spin crossover to occur was shown. The smoothness of spin crossover depends on the parameters of chain elasticity and the crossover position on the temperature scale is defined by the dependence of exchange integral on the cluster deformation. The proposed model qualitatively describes the main scenario of spin crossover effect in the chain polymer heterospin complex of copper(II) hexafluoroacetylacetonate with methyl pyrazol-substituted nitronyl nitroxide containing two-spin exchange clusters.

Graphical abstract: Spin crossover in an elastic chain of exchange clusters beyond mean field approximation

Article information

Article type
Paper
Submitted
16 Mar 2010
Accepted
22 Jul 2010
First published
23 Sep 2010

Phys. Chem. Chem. Phys., 2010,12, 13667-13673

Spin crossover in an elastic chain of exchange clusters beyond mean field approximation

V. Morozov, N. Lukzen and V. Ovcharenko, Phys. Chem. Chem. Phys., 2010, 12, 13667 DOI: 10.1039/C004287K

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