Dynamical Phase Transition in a Spin-Crossover Complex

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  • Liu XiaoJun
    Department of Applied Physics, Nagoya University PRESTO, JST
  • Moritomo Yutaka
    Department of Applied Physics, Nagoya University PRESTO, JST
  • Kawamoto Tohru
    Nanotechnology Research Institute (NRI) and Research Consortium for Synthetic Nano-Function Materials Project (SYNAF), National Institute of Advanced Industrial Science and Technology (AIST)
  • Nakamoto Akio
    Graduate School of Arts and Sciences, University of Tokyo
  • Kojima Norimichi
    Graduate School of Arts and Sciences, University of Tokyo

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Density nHS of photoexcited high-spin (HS) sites in a spin–crossover film (Nafion-[Fe(Htrz)3]; Htrz = 1,2,4-4H-triazole) was systematically investigated against temperature T and excitation power density P. At low temperatures (≤35 K), the nHS–P curve shows a nonlinear increase when P reaches a critical value (Pc). We interpreted the increase in terms of the dynamical phase transition into the condensed state of photoexcited HS molecules, and derived the P–T phase diagram. The P–T phase diagram and the nHS–P curves were analyzed with an Ising-like model which includes a temperature-dependent field.

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