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Phys. Rev. B 79, 172405 (2009) [4 pages]

Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

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M. H. Qin and K. F. Wang
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

J. M. Liu*
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China; School of Physics, South China Normal University, Guangzhou 510006, China; and International Center for Materials Physics, Chinese Academy of Science, Shenyang 110016, China

Received 7 March 2009; published 13 May 2009

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca3Co2O6 compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.172405
DOI:
10.1103/PhysRevB.79.172405
PACS:
75.40.Mg, 02.70.Uu, 05.50.+q

*liujm@nju.edu.cn

 
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