Phys. Rev. B 67, 012102 (2003) [3 pages]Optical hysteresis in a spin-crossover complexReceived 2 August 2002; revised 21 November 2002; published 21 January 2003 Photoexcitation effects on the spin states were investigated for a prototypical spin-crossover complex [Fe(ptz)6](BF4)2 (ptz=1-propyltetrazole) by the pump and probe technique at 77 K. We have found (i) superlinear increase of density nHS of the photoexcited high-spin molecules when the excitation power density P exceeded a critical value (=120mW/cm2) and (ii) optical hysteresis between the P-increasing and the P-decreasing runs. These characteristic features are well reproduced by the Monte Carlo simulation based on the Ising model, in which the spin state of the respective Fe2+ ion is represented by the pseudospins. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.012102
DOI:
10.1103/PhysRevB.67.012102
PACS:
64.90.+b
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