Monte Carlo simulation of pressure-induced phase transitions in spin-crossover materials

Details Monte Carlo simulation of pressure-induced phase transitions in spin-crossover materials Monte Carlo simulation of pressure-induced phase transitions in spin-crossover materials

2007-07-03

arxiv.org/abs/0707.0352v1

Phys. Rev. Lett. 100, 067206 (2008)

Physics

Condensed Matter

Materials Science

5 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.100.067206

Pressure-induced phase transitions of spin-crossover materials were simulated by a Monte Carlo simulation in the constant pressure ensemble for the first time. Here, as the origin of the cooperative interaction, we adopt elastic interaction among the distortions of the lattice due to the difference of the molecular sizes in different spin states, i.e., the high spin (HS) state and the low spin (LS) state. We studied how the temperature dependence of the ordering process changes with the pressure, and we obtained a standard sequence of temperature dependences that has been found in changing other parameters such as strength of the ligand field (S. Miyashita et al., Prog. Theor. Phys. \textbf{114}, 719 (2005)). Various effects of pressure on the spin-crossover ordering process are examined from a unified point of view.

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