What is the origin of anomalous dielectric response in 2D organic dimer Mott insulators κ-(BEDT-TTF)2Cu[N(CN)2]Cl and κ-(BEDT-TTF)2Cu2(CN)3

Pinterić, Marko; Ivek, Tomislav; Čulo, Matija; Milat, Ognjen; Basletić, Mario; Korin-Hamzić, Bojana; Tafra, Emil; Hamzić, Amir; Dressel, Martin; Tomić, Silvia

doi:10.1016/j.physb.2014.11.071

Cited by 22 publications

(26 citation statements)

References 43 publications

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“…Recent Raman spectroscopy evidences the presence of neutral TMTTF 0 and ionized TMTTF −1 molecules, which are assigned to charged domain walls [56]. It is worthwhile to mention that in the two-dimensional charge-transfer salts κ-(BEDT-TTF) 2 X, with X = Cu[N(CN) 2 ]Cl [98], Cu 2 (CN) 3 [99,100] and Ag 2 (CN) 3 [101], as well as in α-(BEDT-TTF) 2 I 3 [102,103], charge domain walls are also considered to give rise to an anomalous dielectric response in the audio-and radio-frequency range. For (TMTTF) 2 ClO 4 and (TMTTF) 2 ReO 4 the activation energies of the relaxation time τ 0 (T) agree well with dc-transport measurements, in accord with the observations for (TMTTF) 2 PF 6 [31] and (TMTTF) 2 AsF 6 [35,86].…”

Section: Discussionmentioning

confidence: 99%

Structural and Electronic Properties of (TMTTF)2X Salts with Tetrahedral Anions

et al. 2018

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Comprehensive measurements of the pressure-and temperature-dependent dc-transport are combined with dielectric spectroscopy and structural considerations in order to elucidate the charge and anion orderings in the quasi-one-dimensional charge-transfer salts (TMTTF) 2 X with non-centrosymmetric anions X = BF 4 , ClO 4 and ReO 4. Upon applying hydrostatic pressure, the charge-order transition is suppressed in all three compounds, whereas the influence on the anion order clearly depends on the particular compound. A review of the structural properties paves the way for understanding the effect of the anions in their methyl cavities on the ordering. By determining the complex dielectric constantˆ (ω, T) in different directions we obtain valuable information on the contribution of the anions to the dielectric properties. For (TMTTF) 2 ClO 4 and (TMTTF) 2 ReO 4 , b exhibits an activated behavior of the relaxation time with activation energies similar to the gap measured in transport, indicating that the relaxation dynamics are determined by free charge carriers.

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Section: Discussionmentioning

confidence: 99%

Structural and Electronic Properties of (TMTTF)2X Salts with Tetrahedral Anions

et al. 2018

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“…However, even for the two -type systems, -(ET) 2 Cu 2 (CN) 3 and -(ET) 2 Cu[N(CN) 2 ]Cl, markedly different dielectric behaviour is found [139]. The first compound is characterized by dipolar and magnetic degrees of freedom that, however, both do not develop long-range order [8].…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, the latter system was found to be multiferroic, showing both dipolar and magnetic order and an especially close coupling of the magnetic and dipolar degrees of freedom, for which a new type of electric-dipole driven multiferroic mechanism was proposed [7]. Frustration effects arising from the triangular lattices within the ET planes, which exhibit different anisotropies, may explain these different low-temperature phases of both materials [139] but the details are far from being understood. In fact, even the nature of the dipolar degrees of freedom in these systems is not yet clarified, especially concerning the role of CO, for which no clear evidence was found until now [126].…”

Section: Discussionmentioning

confidence: 99%

Dielectric spectroscopy on organic charge-transfer salts

Lunkenheimer

Loidl

2015

J. Phys.: Condens. Matter

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This Topical Review provides an overview of the dielectric properties of a variety of organic chargetransfer salts, based on both, data reported in literature and our own experimental results. Moreover, we discuss in detail the different processes that can contribute to the dielectric response of these materials. We concentrate on the family of the one-dimensional (TMTTF) 2 X systems and the two-dimensional BEDT-TTF-based charge-transfer salts, which in recent years have attracted considerable interest due to their often intriguing dielectric properties. We will mainly focus on the occurrence of electronic ferroelectricity in these systems, which also includes examples of multiferroicity.

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“…Nevertheless, anomalous lattice effects, electric polarization switching, anomalous dielectric, microwave and optical response were discussed in favor of charge-order-driven ferroelectricity [168][169][170][171][172][173]. In order to reconcile these seemingly opposite findings alternative approaches were developed most recently [174][175][176]; but at the moment, many open questions are still waiting to be answered. For this reason we give here only a brief account of the state of the art aiming to motivate further experimental and theoretical efforts in order to solve this interesting puzzle.…”

Section: Ordering In Two-dimensional κ-(Bedt-ttfmentioning

confidence: 99%

Ferroelectricity in molecular solids: a review of electrodynamic properties

Tomić

Dressel

2015

Rep. Prog. Phys.

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In conventional ferroelectrics the polarization is induced either by the relative displacement of positive and negative ions due to a lattice distortion or by the collective alignment of permanent electric dipoles. Strongly correlated materials with the inversion-symmetry-broken ground states feature electronic ferroelectricity, a phenomenon which has recently caught the attention of condensed matter physicists due to its great fundamental and technological importance. The discovery of electronic ferroelectricity in one and two-dimensional molecular solids is an exciting development because they show a rich variety of nonlinear properties and complex electrodynamics, including nontrivial emergent excitations. We summarize key experimental results, sketch the current theoretical understanding and outline promising prospects of this phenomenon which have great potential for future electronic devices.

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What is the origin of anomalous dielectric response in 2D organic dimer Mott insulators κ-(BEDT-TTF)2Cu[N(CN)2]Cl and κ-(BEDT-TTF)2Cu2(CN)3

Cited by 22 publications

References 43 publications

Structural and Electronic Properties of (TMTTF)2X Salts with Tetrahedral Anions

Structural and Electronic Properties of (TMTTF)2X Salts with Tetrahedral Anions

Dielectric spectroscopy on organic charge-transfer salts

Ferroelectricity in molecular solids: a review of electrodynamic properties

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