Energy and Dielectric Relaxation in Bechgaard-Fabre Salts (CROSBI ID 35386)
Prilog u knjizi | izvorni znanstveni rad
Podaci o odgovornosti
Monceau, Pierre ; Lasjaunias, Jean-Claude ; Biljaković, Katica ; Nad, Felix
engleski
Energy and Dielectric Relaxation in Bechgaard-Fabre Salts
We present an overview of energy and dielectric relaxation measurements on Bechgaard-Fabre salts, which enlarge the already very rich phase diagram. It is shown that a now generic property of the whole family of (TMTTF)2X Fabre salts is charge ordering, which occurs in the temperature range of 40-200 K. This new electronic charge superstructure at 4kF, a generalization of the clas¬ ; ; sical Wigner crystal, manifests itself by a ferroelectric character. Specific heat measurements in different controlled kinetic conditions in the vicinity of the sub-phase at 3.5 K in the spin-density wave state of (TMTSF)2PF6 show features characteristic of freezing in supercooled liquids, indicating a glass transition. Thermodymimical measurements below 1 K on both (TMTTF)2X and (TMTSF)2X salts reveal extremely long dynamics of energy relaxation and nonequilibrium phenomena (aging). For incommensurate Bechgaard salts, the relaxation time distribution is Gaussian while for commensurate ground states in Fabre salts, it shows a bimodal character.
(TMTTF)2X, (TMTSF)2X, spin density waves, ferroelectric order, glass transition, energy relaxation, dielectric relaxation
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Podaci o prilogu
399-402.
objavljeno
Podaci o knjizi
The Physics of Organic Superconductors and Conductors
Lebed, A. G.
Berlin: Springer
2008.
987-3-540-76667-4