Charge density glass dynamics – Soft potentials and soft modes

Biljaković, Katica; Starešinić, Damir; Lasjaunias, J.C.; Reményi, G.; Mélin, R.; Monçeau, P.; Sahling, S.

doi:10.1016/j.physb.2012.01.020

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…From this point of view, the low-frequency Raman mode is interpreted as a Boson peak arising from charge fluctuations between two molecular dimer sites. In analogy to the charge-density wave phenomenology, we speculate that the low-frequency Raman mode (Boson peak) and the dielectric mode in kHz-MHz range represent fingerprints of the same phenomenon [629,630]: the formation of dipole liquid state occurs on the local scale and bears glassy signatures. This interpretation is in accord with previous observations: systems with strong Boson peaks above T g tend to be those with strong liquid character [206,631,632].…”

Section: Glassy Behaviormentioning

confidence: 76%

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Dressel

Tomić

2020

Advances in Physics

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This review provides a perspective on recent developments and their implications for our understanding of novel quantum phenomena in the physics of two-dimensional organic solids. We concentrate on the phase transitions and collective response in the charge sector, the importance of coupling of electronic and lattice degrees of freedom and stress an intriguing role of disorder. After a brief introduction to low-dimensional organic solids and their crystallographic structures, we focus on the dimensionality and interactions and emergent quantum phenomena. Important topics of current research in organic matter with sizeable electronic correlations are Mott metal-insulator phase transitions, charge order and ferroelectricity. Highly frustrated two-dimensional systems are established model compounds for studying the quantum spin liquid state and the competition with magnetic long-range order. There are also unique examples of quantum disordered state of magnetic and electric dipoles. Representative experimental results are complemented by current theoretical approaches.

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Section: Glassy Behaviormentioning

confidence: 76%

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Dressel

Tomić

2020

Advances in Physics

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“…Cp/fiT1 , plots of several IC compounds, with p the coefficient of the Debye law. The left and middle panels are charge density wave compounds [K0 3MoO3 [20], (TaSe4)2I [22], KCP [20], and TaS3 [23] ]. The CP//3T} plot of vitreous silica is displayed as a comparison [19].…”

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confidence: 99%

Incommensurate Systems as Model Compounds for Disorder Revealing Low-Temperature Glasslike Behavior

et al. 2015

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We show that the specific heat of incommensurately modulated crystals with broken translational periodicity presents similar features at low temperatures to those of amorphous and glass materials. Here we demonstrate that the excess to the constant C_{p}(T)/T^{3} law (or Debye limit) is made up of an upturn below 1 K and of a broad bump at T≈10 K that directly originates from the gapped phase and amplitude modes of the incommensurate structure. We argue that the low-energy dynamics of incommensurate systems constitute a plausible simplification of the landscape of interactions present in glasses, giving rise to their low-temperature anomalies.

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“…The present demonstrations will shed light on the possible microscopic understanding of experimental observations 2,3) of dielectric anomalies seen in the range of 10 KHz based on the familiar microscopic model Hamiltonian for electrons in solids describing the competitions between dimer-Mott and charge ordering which are typical states in the presence of strong correlations in quarter-filled bands. It is to be noted that interesting phenomena observed in specific heat 19,20) and infrared optical measurements 21) are in different energy region from the present studies, though these will be mutually interrelated. Finally, we give brief comments on the relevance of the present scheme to experimentally observed KHz dynamics in a mono-axial chiral helimagnet 22,23) near the boundary of magnetic phase transitions.…”

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confidence: 48%

Energy Landscape of Charge Excitations in the Boundary Region between Dimer–Mott and Charge Ordered States in Molecular Solids

2017

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Charge density glass dynamics – Soft potentials and soft modes

Cited by 4 publications

References 27 publications

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Incommensurate Systems as Model Compounds for Disorder Revealing Low-Temperature Glasslike Behavior

Energy Landscape of Charge Excitations in the Boundary Region between Dimer–Mott and Charge Ordered States in Molecular Solids

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