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• W4226453610 abstract "The temperature induced neutral to ionic phase transition (TI-NIT) is a rare phenomenon occurring in mixed stack charge transfer (CT) crystals made up of alternating $ensuremath{pi}$-electron donor (D) and acceptor (A) molecules. We were able to grow crystals of tetrathiafulvalene-fluoranil (TTF-FA), and to show that it undergoes TI-NIT like the prototype CT crystal TTF-chloranil. We characterized both room and low-T phases through IR and Raman spectroscopy and x-ray diffraction, demonstrating that while TTF-FA is quasineutral at room temperature, its ionicity jumps from 0.15 to 0.7 at low T, therefore crossing the neutral-ionic borderline. The transition, occurring around 150 K, is first order, with large thermal hysteresis and accompanied by crystal cracking. In the high-T phase D and A molecules lie on inversion center, i.e., the stacks are regular, whereas the low-T phase is characterized by the loss of the inversion symmetry along the stack as the stacks are strongly dimerized and by the doubling of the unit cell." @default.
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• W4226453610 date "2022-02-22" @default.
• W4226453610 modified "2023-10-14" @default.
• W4226453610 title "Temperature-induced neutral-to-ionic phase transition of the charge-transfer crystal tetrathiafulvalene-fluoranil" @default.
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• W4226453610 doi "https://doi.org/10.1103/physrevb.105.054106" @default.
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