(BEDT-TTF)2Cu2(CN)3 Spin Liquid: Beyond the Average Structure

Foury-Leylekian, P.; Ilakovac, V.; Balédent, V.; Fertey, Pierre; Arakcheeva, A. V.; Milat, Ognjen; Petermann, D.; Guillier, Gilles; Miyagawa, Kazuya; Kanoda, K.; Alemany, Pere; Canadell, Enric; Tomić, Silvia; Pouget, Jean‐Paul

doi:10.3390/cryst8040158

Cited by 19 publications

(22 citation statements)

References 66 publications

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“…In closing, we note that the dielectric response scenario presented in this section, was recently backed up by the theoretical approach developed to explain anomalous dielectric response in strongly correlated molecular solids [62]. Most importantly, in-depth X-ray diffraction measurements of κ-CuCN in the wide temperature range and refinements, complemented by DFT calculations, have demonstrated that two nonequivalent dimers exist in the unit cell due to the reduced symmetry of the whole crystal [63].…”

Section: Quantum Spin Liquids In Disordered κ-(Bedt-ttf) 2 Cu 2 (Cn) mentioning

confidence: 78%

Electrodynamics in Organic Dimer Insulators Close to Mott Critical Point

et al. 2018

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Organic layered charge-transfer salts κ-(BEDT-TTF) 2 X form highly frustrated lattices of molecular dimers in which strong correlations give rise to Mott insulating states situated close to the metal-to-insulator phase boundary. The salts κ-(BEDT-TTF) 2 Cu 2 (CN) 3 and κ-(BEDT-TTF) 2 Ag 2 (CN) 3 have been considered as prime candidates for a quantum spin liquid, while κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl has been suggested as a prototypical charge-order-driven antiferromagnet. In this paper, we summarize and discuss several key results, including some not reported previously, obtained in search to clarify the competition of these two ground states. The origin of anomalous dielectric response found at low temperatures in all three salts is also discussed. We conclude by pointing out the relevant new insights into the role of frustration and random disorder in the suppression of magnetic ordering and formation of the spin liquid state.

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Section: Quantum Spin Liquids In Disordered κ-(Bedt-ttf) 2 Cu 2 (Cn) mentioning

confidence: 78%

Electrodynamics in Organic Dimer Insulators Close to Mott Critical Point

et al. 2018

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“…The space group is commonly solved in monoclinic P2 1 /c, in which all four BEDT-TTF molecules are equivalent [69,70]. However, the P2 1 /c is only the average structure, while the exact structure presents a triclinic symmetry with two non-equivalent crystallographic sites [71,72]. In the panel (d) to (f) the projection of one of the layers is shown.…”

Section: β -(Bedt-ttf) 2 Sf 5 Rsomentioning

confidence: 99%

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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“…The situation is more complex when disorder also occurs in the anion lattice, as for instance in κ-(BEDT-TTF) 2 Cu 2 (CN) 3 . [185,[187][188][189] adding an extra structural degree of freedom.…”

Section: Shown Inmentioning

confidence: 99%