Study of Low Temperature Magnetic Properties of a Single Chain Magnet with Alternate Isotropic and Non-collinear Anisotropic Units

Sahoo, Shaon and Sutter, Jean-Pascal and Ramasesha, S (2012) Study of Low Temperature Magnetic Properties of a Single Chain Magnet with Alternate Isotropic and Non-collinear Anisotropic Units. In: Journal of Statistical Physics, 147 (1). pp. 181-193.

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Abstract

Here we study thermodynamic properties of an important class of single-chain magnets (SCMs), where alternate units are isotropic and anisotropic with anisotropy axes being non-collinear. This class of SCMs shows slow relaxation at low temperatures which results from the interplay of two different relaxation mechanisms, namely dynamical and thermal. Here anisotropy is assumed to be large and negative, as a result, anisotropic units behave like canted spins at low temperatures; but even then simple Ising-type model does not capture the essential physics of the system due to quantum mechanical nature of the isotropic units. We here show how statistical behavior of this class of SCMs can be studied using a transfer matrix (TM) method. We also, for the first time, discuss in detail how weak inter-chain interactions can be treated by a TM method. The finite size effect is also discussed which becomes important for low temperature dynamics. At the end of this paper, we apply this technique to study a real helical chain magnet.

Item Type:	Journal Article
Publication:	Journal of Statistical Physics
Publisher:	Springer
Additional Information:	Copyright of this article is belongs to Springer.
Keywords:	Single chain magnets;Alternate isotropic and anisotropic units;Inter-chain interaction
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Physical & Mathematical Sciences > Physics
Date Deposited:	13 Aug 2012 10:09
Last Modified:	13 Aug 2012 10:11
URI:	http://eprints.iisc.ac.in/id/eprint/44479

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