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| κ-(BEDT-TTF)2Cu2(CN)3 | |
|---|---|
| Name | κ-(BEDT-TTF)2Cu2(CN)3 |
| Formula | C44H34S8Cu2N3 |
κ-(BEDT-TTF)2Cu2(CN)3 is an organic charge-transfer salt composed of bis(ethylenedithio)tetrathiafulvalene donors and copper cyanide anions, known for exhibiting a triangular lattice Mott insulator proximate to quantum spin liquid and superconducting phases. The material has been central to studies connecting low-dimensional correlated electron physics, frustrated magnetism, and unconventional superconductivity in the tradition of research on cuprates and heavy-fermion compounds. Its discovery and investigation have involved collaborations among groups associated with Max Planck Society, University of Tokyo, Nagoya University, ETH Zurich, and National Institute for Materials Science.
κ-(BEDT-TTF)2Cu2(CN)3 was synthesized and characterized in the context of organic superconductors following seminal work on BEDT-TTF salts by researchers at University of Cambridge and RIKEN. The compound is notable for combining motifs from studies of the Hubbard model on the triangular lattice and experimental programs linked to Paul Dirac's interests in low-dimensional systems, with experimental collaborations including groups from Princeton University, University of California, Berkeley, Columbia University, and Oak Ridge National Laboratory. It occupies a position in the phase diagrams explored in analogy to the phase diagram of cuprates and inspired theoretical links to models used in Anderson localization and Resonating valence bond theory.
The crystal structure of κ-(BEDT-TTF)2Cu2(CN)3 features layered arrangements where conducting donor layers of BEDT-TTF molecules alternate with insulating anion layers containing copper and cyanide networks, a motif comparable to that in organic salts studied at Tohoku University and Hokkaido University. The κ packing motif produces dimers of BEDT-TTF molecules arranged on an anisotropic triangular lattice, a geometry reminiscent of lattices discussed by P. W. Anderson and analyzed using approaches developed at Stanford University and Harvard University. X-ray diffraction and crystallographic refinements were performed by teams linked to Institut Laue-Langevin and Diamond Light Source.
Electronically, κ-(BEDT-TTF)2Cu2(CN)3 is a half-filled band Mott insulator at ambient pressure with strong on-site Coulomb repulsion described within the Hubbard model; this perspective aligns with analyses from researchers at University of Cambridge, University of Oxford, and University of Tokyo. Optical conductivity, angle-resolved experiments, and transport studies conducted by groups at Bell Labs, University of Illinois Urbana-Champaign, and Los Alamos National Laboratory probe charge dynamics and spectral weight transfer similar to observations in high-temperature superconductors and organic conductors. The interplay of bandwidth, dimerization, and frustration has been interpreted using methods developed at Max Planck Institute for Solid State Research and RIKEN.
Magnetically, κ-(BEDT-TTF)2Cu2(CN)3 exhibits no long-range magnetic order down to millikelvin temperatures, a behavior identified via muon spin rotation, nuclear magnetic resonance, and susceptibility studies by teams at Paul Scherrer Institute, RIKEN, Tohoku University, École Normale Supérieure, and University of Stuttgart. The absence of ordering despite antiferromagnetic interactions has been discussed in the framework of the quantum spin liquid proposal associated with Phil Anderson and analyzed using numerical techniques advanced at Los Alamos National Laboratory, Institute for Advanced Study, and University of California, Santa Barbara. Thermal conductivity and specific heat measurements reported by groups at Kobe University, Kyoto University, and University of British Columbia have been central to debates over gapless versus gapped spin excitations, paralleling questions raised in studies of herbertsmithite and kagome lattice materials investigated at MIT.
Under moderate hydrostatic pressure or chemical pressure via anion substitution, κ-(BEDT-TTF)2Cu2(CN)3 undergoes a transition from a Mott insulating state toward superconductivity, an evolution investigated using diamond anvil cells and pressure cells at Cornell University, Nagoya University, University of Geneva, and Argonne National Laboratory. The superconducting phase, with comparisons to unconventional superconductors studied at University of Cambridge and University of Tokyo, raises questions about pairing symmetry and the role of proximity to a spin liquid, topics pursued by theorists at Perimeter Institute, University of Waterloo, and Princeton University. High-pressure NMR and transport experiments at National High Magnetic Field Laboratory and Rice University characterize the pressure-temperature phase diagram analogous to pressure studies on organic superconductors and heavy-fermion superconductors.
Key experimental techniques applied to κ-(BEDT-TTF)2Cu2(CN)3 include single-crystal X-ray diffraction at facilities like Diamond Light Source and SPring-8, NMR and nuclear quadrupole resonance at labs including RIKEN and Paul Scherrer Institute, muon spin rotation at TRIUMF, thermal transport at Los Alamos National Laboratory, and Raman and infrared spectroscopy performed by teams at University of Geneva and ETH Zurich. Scanning probe methods employed by groups at IBM Research and University of California, San Diego complement bulk probes from ISIS Neutron and Muon Source and Institut Laue-Langevin.
Theoretical interpretations of κ-(BEDT-TTF)2Cu2(CN)3 harness the single-band and multi-band Hubbard model on the anisotropic triangular lattice, resonating valence bond ideas by Phil Anderson, spinon and gauge field descriptions developed at Princeton University and Perimeter Institute, and numerical approaches such as variational Monte Carlo and density matrix renormalization group advanced at ETH Zurich, University of Tokyo, and Los Alamos National Laboratory. Competing scenarios include gapless U(1) spin liquids, Z2 spin liquids, and proximate superconducting instabilities explored in theoretical work associated with Rutgers University, Columbia University, and Harvard University. Experimental constraints from NMR, thermal transport, and optical studies feed back into model selection in collaborations spanning Max Planck Society and CNRS.
Category:Organic conductors