Thermodynamics of the Neutral-to-Ionic Transition as Condensation and Crystallization of Charge-Transfer Excitations

Lemée-Cailleau, Marie–Hélène; Cointe, M. Le; Cailleau, H.; Luty, Tadeusz; Moussa, F.; Roos, J.; Brinkmann, D.; Toudic, Bertrand; Ayache, C.; Karl, N.

doi:10.1103/physrevlett.79.1690

Cited by 130 publications

(136 citation statements)

References 25 publications

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“…In Figure 3, the p-T-phase diagram is depicted that is composed of several studies of different properties, i.e., electric transport [11], optical measurements [14,21,[28][29][30][31][32][33], neutron scattering experiments and 35 Cl NQR [34,35]. The phase diagram reveals similarities to a solid-liquid-gas phase diagram with a triple point at 210 K and 500 MPa where all three phases coexist.…”

Section: Parametermentioning

confidence: 99%

“…The phase diagram resembles the characteristic of a solid-liquid-gas phase diagram. The red circles refer to neutron scattering and the blue plus signs to NQR results [34]; the violet triangle is obtained by vibrational spectroscopy [21,28,29]; the green square is extracted from transport measurements [11,30]. The black dot around T c = 260 K and a pressure slightly above 700 MPa indicates the critical point labelled by C. Adapted from [6].…”

Section: Parametermentioning

confidence: 99%

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Infrared Investigations of the Neutral-Ionic Phase Transition in TTF-CA and Its Dynamics

Dressel

Peterseim

2017

Crystals

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Abstract:The neutral-ionic phase transition in TTF-CA was investigated by steady-state and time-resolved infrared spectroscopy. We describe the growth of high-quality single crystals and their characterization. Extended theoretical calculations were performed in order to obtain the band structure, the molecular vibrational modes and the optical spectra along all crystallographic axes. The theoretical results are compared to polarization-dependent infrared reflection experiments. The temperature-dependent optical conductivity is discussed in detail. We study the photo-induced phase transition in the vicinity of thermally-induced neutral-ionic transition. The observed temporal dynamics of the photo-induced states is attributed to the random-walk of neutral-ionic domain walls. We simulate the random-walk annihilation process of domain walls on a one-dimensional chain.

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Section: Parametermentioning

confidence: 99%

Section: Parametermentioning

confidence: 99%

Infrared Investigations of the Neutral-Ionic Phase Transition in TTF-CA and Its Dynamics

Dressel

Peterseim

2017

Crystals

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“…Fluctuations that lead to charge inhomogeneties give rise to a large compressibility and a soft lattice in one-dimensional models [5,6]basically the very soft lattice could have small variations of the on-site Coulomb interaction [6,7]. This can occur for an insulating system.…”

Section: (Received 30 June 1999)mentioning

confidence: 99%

“…The ferroelectric material is essentially a wide band gap n-type semiconductor [3]. Charge and orbital fluctuations [5][6][7] would appear to be very unlikely in this system with strong oriented dipoles and fully saturated nonconjugated bonds. Phase transitions in which the electronic structure is coupled to the dynamic motions of the lattice can leave a signature as a change in the lattice structure, the mean-square displacement of the atoms, the Debye temperature, a shift in the phonon modes, or the compressibility of the lattice.…”

Section: (Received 30 June 1999)mentioning

confidence: 99%

Lattice-Stiffening Transition in Copolymer Films of Vinylidene Fluoride (70%) with Trifluoroethylene (30%)

et al. 1999

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“…. and recently evidenced by X-ray diffuse scattering , and at last their three-dimensional condensation and ordering giving rise to a phase diagram similar to the solid-liquid-gas one (Lemee-Cailleau et al, 1997;Luty et al, 2002).…”

Section: Cooperative Effects Around Neutral-ionic Phase Transitionmentioning

confidence: 99%

State of the art and opportunities in probing photoinduced phase transitions in molecular materials by conventional and picosecond X-ray diffraction

Collet¹,

Cointe²,

Lorenc³

et al. 2008

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. The optical control of the macroscopic physical properties (magnetic, optical . . .) of a material by laser irradiation is gaining interest through the emerging field of photoinduced phase transitions. Light-induced changes of the macroscopic state of a material involves subtle coupling between the electronic and structural degrees of freedom, which are essential to stabilize the photo-excited state, different in nature from the stable state. Therefore the new experimental field of photocrystallography plays a key role. It goes far beyond simple structural analysis under laser excitation. By playing on different physical parameters and developing the techniques and analysis, one can investigate new out of equilibrium physics through light-driven cooperative dynamics and transformations in materials. This paper is reviewing different aspects of the use of photocrystallography to investigate the nature, the mechanisms and the dynamics of photoinduced phase transitions for photo-steady or long-lived states, as well as transformations driven by an ultra-short light pulse. We also give a brief overview on recent advances in time-resolved crystallography with 100 ps resolution.

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Thermodynamics of the Neutral-to-Ionic Transition as Condensation and Crystallization of Charge-Transfer Excitations

Cited by 130 publications

References 25 publications

Infrared Investigations of the Neutral-Ionic Phase Transition in TTF-CA and Its Dynamics

Infrared Investigations of the Neutral-Ionic Phase Transition in TTF-CA and Its Dynamics

Lattice-Stiffening Transition in Copolymer Films of Vinylidene Fluoride (70%) with Trifluoroethylene (30%)

State of the art and opportunities in probing photoinduced phase transitions in molecular materials by conventional and picosecond X-ray diffraction

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