Spectroscopic Studies of the Phase Transition from the Mott Insulator State to the Charge-Ordering State of κ-(ET)4M(CN)6N(C2H5)4·2H2O (M = Co(III) and Fe(III)) Salts - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry A Année : 2014

Spectroscopic Studies of the Phase Transition from the Mott Insulator State to the Charge-Ordering State of κ-(ET)4M(CN)6N(C2H5)4·2H2O (M = Co(III) and Fe(III)) Salts

Résumé

Polarized reflectivity spectra versus temperature of two isostructural charge-transfer salts κ-(ET)4[M(CN)6][N(C2H5)4]·2H2O (M = Co(III) and Fe(III)) (ET = bis(ethylenedithio)tetrathiafulvalene) were studied. The electronic and vibrational spectra exhibit a drastic change at around 150 K. On the basis of the spectral analysis, we deduced the nature of the phase transition. The phase transition at 150 K is due to a charge ordering; above this temperature, strong charge fluctuations are observed.

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Chimie
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Dates et versions

hal-01089778 , version 1 (02-12-2014)

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Andrzej Łapiński, Roman Świetlik, Lahcène Ouahab, Stéphane Golhen. Spectroscopic Studies of the Phase Transition from the Mott Insulator State to the Charge-Ordering State of κ-(ET)4M(CN)6N(C2H5)4·2H2O (M = Co(III) and Fe(III)) Salts. Journal of Physical Chemistry A, 2014, 117 (25), pp.5241-5250. ⟨10.1021/jp402027x⟩. ⟨hal-01089778⟩
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