Spin and Charge Transport in the X-ray Irradiated Quasi-2D Layered Compound: κ-(BEDT-TTF)2Cu[N(CN)2]Cl

Antal, Ágnes; Fehér, Titusz; Yoneyama, N.; Forró, Lászlø; Sasaki, T.; Jànossy, A.

doi:10.3390/cryst2020579

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…The minor ESR signal shifts to lower fields and can be clearly identified as a separate maximum below T = 2.5 K. In Figure 66(d) the angular dependence of the ESR signal is displayed, revealing two low-temperature features with a large anisotropy of about 10 mT, which are symmetrically shifted by ±22 • with respect to the main signal. A similar behavior has been reported for κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl, due to crystallographically inequivalent adjacent layers [582][583][584], depicted in Figure 6. For the monoclinic symmetry of κ-(BEDT-TTF) 2 Cu 2 (CN) 3 , this explanation does not hold; hence stacking faults in the crystal are suggested to cause the doubling of the line.…”

Section: Valence-bond Solidsupporting

confidence: 82%

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: Valence-bond Solidsupporting

confidence: 82%

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

Dressel

Tomić

2020

Advances in Physics

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“…Actually, the molecular disorder introduced by X-ray irradiation to the organic superconductor κ-(BEDT-TTF) 2 Cu(NCS) 2 increases the residual resistivity, and suppresses the superconductivity [18,27]. We investigated the X-ray irradiation effect widely in κ-(BEDT-TTF) 2 X showing superconductivity or Mott insulating state from the viewpoint of the relation between the correlated electronic states and randomness [20,[27][28][29][30][31][32][33][34]. Recently, we found that the weak molecular disorder introduced by X-ray irradiation of the organic superconductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br induced the Anderson-type localization insulating state from the strongly correlated metallic/superconducting state [31].…”

Section: Introductionmentioning

confidence: 99%

Mott-Anderson Transition in Molecular Conductors: Influence of Randomness on Strongly Correlated Electrons in the κ-(BEDT-TTF)2X System

Sasaki

2012

Crystals

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Abstract:The Mott-Anderson transition has been known as a metal-insulator (MI) transition due to both strong electron-electron interaction and randomness of the electrons. For example, the MI transition in doped semiconductors and transition metal oxides has been investigated up to now as a typical example of the Mott-Anderson transition for changing electron correlations by carrier number control in concurrence with inevitable randomness. On the other hand, molecular conductors have been known as typical strongly correlated electron systems with bandwidth controlled Mott transition. In this paper, we demonstrate our recent studies on the randomness effect of the strongly correlated electrons of the BEDT-TTF molecule based organic conductors. X-ray irradiation on the crystals introduces molecular defects in the insulating anion layer, which cause random potential modulation of the correlated electrons in the conductive BEDT-TTF layer. In combination with hydrostatic pressure, we are able to control the parameters for randomness and correlations for electrons approaching the Mott-Anderson transition.

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“…By now, there are various studies which have utilized X-ray irradiation to probe the interplay of disorder and correlations close to the Mott transition in κ-phase chargetransfer salts [139,140,[147][148][149][150][151][152][153][154][155][156]. In fact, the corresponding Mott-Anderson model has attracted significant attention from a theoretical perspective, leading to a large number of numerical evaluations of its properties (e.g., Refs.…”

Section: Experimental Study Of Phenomena Close To the Mott Transition...mentioning

confidence: 99%

Ingredients for Generalized Models of κ-Phase Organic Charge-Transfer Salts: A Review

2022

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The families of organic charge-transfer salts κ-(BEDT-TTF)2X and κ-(BETS)2X, where BEDT-TTF and BETS stand for the organic donor molecules C10H8S8 and C10H8S4Se4, respectively, and X for an inorganic electron acceptor, have been proven to serve as a powerful playground for the investigation of the physics of frustrated Mott insulators. These materials have been ascribed a model character, since the dimerization of the organic molecules allows to map these materials onto a single band Hubbard model, in which the dimers reside on an anisotropic triangular lattice. By changing the inorganic unit X or applying physical pressure, the correlation strength and anisotropy of the triangular lattice can be varied. This has led to the discovery of a variety of exotic phenomena, including quantum-spin liquid states, a plethora of long-range magnetic orders in proximity to a Mott metal-insulator transition, and unconventional superconductivity. While many of these phenomena can be described within this effective one-band Hubbard model on a triangular lattice, it has become evident in recent years that this simplified description is insufficient to capture all observed magnetic and electronic properties. The ingredients for generalized models that are relevant include, but are not limited to, spin-orbit coupling, intra-dimer charge and spin degrees of freedom, electron-lattice coupling, as well as disorder effects. Here, we review selected theoretical and experimental discoveries that clearly demonstrate the relevance thereof. At the same time, we outline that these aspects are not only relevant to this class of organic charge-transfer salts, but are also receiving increasing attention in other classes of inorganic strongly correlated electron systems. This reinforces the model character that the κ-phase organic charge-transfer salts have for understanding and discovering novel phenomena in strongly correlated electron systems from a theoretical and experimental point of view.

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Spin and Charge Transport in the X-ray Irradiated Quasi-2D Layered Compound: κ-(BEDT-TTF)2Cu[N(CN)2]Cl

Cited by 3 publications

References 15 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

Mott-Anderson Transition in Molecular Conductors: Influence of Randomness on Strongly Correlated Electrons in the κ-(BEDT-TTF)2X System

Ingredients for Generalized Models of κ-Phase Organic Charge-Transfer Salts: A Review

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