ESR studies on the spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$: anomalous response below $T=8$ K

Abstract

The organic conductor $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$ seems to form a quantum spin liquid, although at low temperatures unusual properties are seen in the charge, spin and lattice degrees of freedom. Here we report results of X-band ESR studies of $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$ single crystals as a function of temperature and angle. We find indications of two anisotropic relaxation mechanisms at low temperatures and compare them to the spin-liquid behavior observed in other strongly correlated systems. In addition, we can recognize charge inhomogeneities in the copper ions of the anion layer. This disorder might be linked to the dielectric response measured in this compound.

arXiv comment4 pages, 4 figures, accepted in Physica B

References in corpus (9)

• Spin Liquid State in an Organic Mott Insulator with Triangular Lattice
• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• Ab initio Derivation of Low-Energy Model for $\kappa$-ET Type Organic Conductors
• Anomalous dielectric response in the dimer Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$
• Lattice effects and entropy release at the low-temperature phase transition in the spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$
• Absence of charge order in the dimerized κ-phase BEDT-TTF salts
• Modes of magnetic resonance in the spin liquid phase of Cs2CuCl4
• Anisotropic charge dynamics in the quantum spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$
• Power-law dependence of the optical conductivity observed in the quantum spin-liquid compound κ-(BEDT-TTF)2Cu2(CN)3

Cited by in corpus (10)

• Quantum Spin Liquids
• Gapped magnetic ground state in quantum-spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$-Cu${}_2$(CN)${}_3$
• Critical Spin Liquid versus Valence Bond Glass in Triangular Lattice Organic $\kappa$-(ET)${}_2$Cu${}_2$(CN)${}_3$
• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
• Spectral function of the $J_1-J_2$ Heisenberg model on the triangular lattice
• Electron Spin Resonance on the spin-1/2 triangular magnet NaYbS2
• Impurity Moments Conceal Low-Energy Relaxation of Quantum Spin Liquids
• Cyclotron resonance inside the Mott gap: a fingerprint of emergent neutral fermions
• Weak ferromagnetism and glassy state in kappa-(BEDT-TTF)2Hg(SCN)2Br
• Gapped magnetic ground state in the spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Ag${}_2$(CN)${}_3$ suggested by magnetic spectroscopy