Metastable states in the triangular-lattice Ising model studied by Monte Carlo simulations: Application to the spin-chain compound Ca[subscript 3]Co[subscript 2]O[subscript 6].
Metastable states in the triangular-lattice Ising model studied by Monte Carlo simulations: Application to the spin-chain compound Ca3Co2O6 (English)

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It is well known that the spin-chain compound Ca[subscript 3]Co[subscript 2]O[subscript 6] exhibits interesting plateaus in the magnetization as a function of the magnetic field at low temperatures. The origin of them is still controversial. In this paper, we study the thermal behavior of this compound with a single-flip Monte Carlo simulation on a triangular lattice and demonstrate the decisive influence of metastable states on the splitting of the ferrimagnetic 1/3 plateau below 10 K. We consider the [Co2O6]n chains as giant magnetic moments described by large Ising spins on planar clusters with open boundary conditions. With this simple frozen-moments model we obtain stepped magnetization curves which agree quite well with the experimental results for different sweeping rates. We describe particularly the out-of-equilibrium states that split the low-temperature 1/3 plateau into three steps. They relax thermally to the 1/3 plateau, which has long-range order at equilibrium. Such metastable states are further analyzed with snapshots unveiling an interlinked mobile domain walls structure that is responsible for the observed behavior of the 1/3 plateau. A comparison is also given of our classical Monte Carlo results with exact diagonalization results in small triangular quantum clusters, providing further support for our thermal description of this compound.

  • Title:
    Metastable states in the triangular-lattice Ising model studied by Monte Carlo simulations: Application to the spin-chain compound Ca[subscript 3]Co[subscript 2]O[subscript 6].
    Metastable states in the triangular-lattice Ising model studied by Monte Carlo simulations: Application to the spin-chain compound Ca3Co2O6
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  • Publisher:
    American Physical Society
  • Year of publication:
    2009
  • Remarks:
    Soto, R. et al. “Metastable States in the Triangular-lattice Ising Model Studied by Monte Carlo Simulations: Application to the Spin-chain Compound Ca3Co2O6.” Physical Review B 79.18 (2009) : 184422 © 2009 The American Physical Society.
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  • Type of media:
    Article (Journal)
  • Type of material:
    Electronic Resource
  • Language:
    English
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