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Desorption-induced first-order phase transition in a cyano-bridged compound

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5 Author(s)
Moritomo, Y. ; Department of Physics, University of Tsukuba, Tsukuba 305-8571, Japan ; Nakada, F. ; Kamioka, H. ; Kim, J.E.
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The guest-host interaction is one of the promising tools to control the material state. Here, we found that a cyano-bridged compound Na0.50Co[Fe(CN)6]0.723.8H2O shows a first-order structural phase transition below a critical pressure Pc (150 Pa) at 300 K. Judging from suppression of the OH stretching mode in the infrared spectra, we ascribed the phase transition to desorption of the ligand waters. The phase transition accompanies a significant change of the visible absorption spectra, reflecting the strong hybridization between the Co eg state and the CNσ states.

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Applied Physics Letters  (Volume:92 ,  Issue: 14 )