Charge-cluster glass in an organic conductor

  title={Charge-cluster glass in an organic conductor},
  author={Fumitaka Kagawa and T. Sato and Kazuya Miyagawa and Kazushi Kanoda and Yoshinori Tokura and K. Kobayashi and Reiji Kumai and Yoichi Murakami},
  journal={Nature Physics},
Geometrically frustrated spin-systems do not order magnetically even at absolute zero, forming instead a spin liquid or a glassy state. An organic conductor in which the charges, rather than spins, are frustrated now shows a similar absence of long-range order, resulting in a charge-cluster glass at low temperature. 

Figures from this paper

Charge-Cluster Glass: Electrons Struggle by Frustration
Systematic investigation of glass formation in molecular charge-ordering systems has clarified the importance of geometrical frustration. In these materials, by kinetically preventing charge order
Charge correlations and their photoinduced dynamics in charge-ordered organic ferroelectrics
The authors find that short-range charge correlations in prototypical electronic ferroelectrics show ultrafast enhancement upon photoexcitation, in contrast to the photoinduced melting of the
Dipolar glass and magneto-electric coupling within a π-stacked organic system
There is much interest in the search for novel materials that show ferroelectric as well as magneto-electric coupling, such as that observed in multiferroics. Within organic based materials the
Advances in Organic Conductors and Superconductors
Crystalline conductors and superconductors based on organic molecules are a rapidly progressing field of solid-state science, involving chemists, and experimental and theoretical physicists from all
Avoiding Stripe Order: Emergence of the Supercooled Electron Liquid
In the absence of disorder, electrons can display glassy behavior through supercooling the liquid state, avoiding the solidification into a charge ordered state. Such supercooled electron liquids are
Strange metal from a frustration-driven charge order instability
Charge-frustration-induced melting of charge order is identified on a conducting organic triangular lattice, with a possible role of quantum effects, with the existence of the frustration-induced quantum melting of charges analogous to spin liquids suggested.
Crystallization and vitrification of electrons in a glass-forming charge liquid
A charge-ordered organic material with an isosceles triangular lattice shows charge dynamics associated with crystallization and vitrification of electrons, which can be understood in the context of an energy landscape arising from the degeneracy of various CO patterns.
Frustration-induced nanometre-scale inhomogeneity in a triangular antiferromagnet
A paradigmatic magnetostructurally inhomogenous ground state of the geometrically frustrated α-NaMnO2 that stems from the system’s aspiration to remove magnetic degeneracy and is possible only due to the existence of near-degenerate crystal structures is reported.
Electronic crystal growth
The temperature profile of the crystal growth is similar to those observed in classical systems and reveals two distinct regimes for the mechanism of electronic crystallization, including resistivity and nuclear magnetic resonance measurements.
Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids
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


Non-Stripe Charge Order in the θ-Phase Organic Conductors
Phase diagrams of charge order patterns of the θ-phase organic conductors are investigated on the basis of the static-limit extended Hubbard model including the second nearest Coulomb repulsion V '...
Spin liquids in frustrated magnets
This exotic behaviour of frustrated magnets is now being uncovered in the laboratory, providing insight into the properties of spin liquids and challenges to the theoretical description of these materials.
Extremely slow charge fluctuations in the metallic state of the two-dimensional molecular conductor theta-(BEDT-TTF)2RbZn(SCN)4.
Large charge disproportionation has been confirmed in the metallic state of a 1/4-filled organic conductor theta-(BEDT-TTF)2RbZn(SCN)4 by means of 13C-NMR analysis on a selectively 13C-enriched
Spin Ice State in Frustrated Magnetic Pyrochlore Materials
The essential physics of spin ice, as it is currently understood, is described and new avenues for future research on related materials and models are identified.
The favored cluster structures of model glass formers
We examine the favored cluster structures for two new interatomic potentials, which both behave as monatomic model glass formers in bulk. We find that the oscillations in the potential lead to global
Stripe glasses: self-generated randomness in a uniformly frustrated system
We show that a system with competing interactions on different length scales, relevant to the formation of stripes in doped Mott insulators, undergoes a self-generated glass transition which is
Charge Order Competition Leading to Nonlinearity in Organic Thyristor Family
Simultaneous synchrotron radiation and transport measurements for the organic thyristor family compound θ-(BEDT-TTF) 2 RbZn(SCN) 4 have revealed the presence of microscopic competing domains between
Frustrated electronic phase separation and high-temperature superconductors
Abstract There is a strong tendency for dilute holes in an antiferromagnet to phase separate. (This is a generic feature of doping into a commensurate correlated insulating state.) We review the
Ordering and Antiferromagnetism in Ferrites
The octahedral sites in the spinel structure form one of the anomalous lattices in which it is possible to achieve essentially perfect short-range order while maintaining a finite entropy. In such a
Random potential effect near the bicritical region in perovskite manganites as revealed by comparison with the ordered perovskite analogs.
The random potential by quenched disorder inherent in the A-site solid solution is found to suppress the respective long-range orders and gives rise to the colossal magnetoresistive state.