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Journal of Statistical Physics

, Volume 147, Issue 1, pp 181–193 | Cite as

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

  • Shaon SahooEmail author
  • Jean-Pascal Sutter
  • S. Ramasesha
Article

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.

Keywords

Single chain magnets Alternate isotropic and anisotropic units Inter-chain interaction 

Notes

Acknowledgement

We are thankful to the Department of Science and Technology (DST), India for financial support.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Department of PhysicsIndian Institute of ScienceBangaloreIndia
  2. 2.Laboratoire de Chimie de CoordinationUniversité de ToulouseToulouseFrance
  3. 3.Solid State & Structural Chemistry UnitIndian Institute of ScienceBangaloreIndia

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