Weak ferromagnetism and glassy state in kappa-(BEDT-TTF)2Hg(SCN)2Br

Abstract

Since the first observation of weak ferromagnetism in the charge-transfer salt kappa-(BEDT-TTF)2-Cu[N(CN)2]Cl [U. Welp et al., Phys. Rev. Lett. 69, 840 (1992)], no further evidence of ferromagnetism in this class of organic materials has been reported. Here we present static and dynamic spin susceptibility measurements on kappa-(BEDT-TTF)2Hg(SCN)2Br revealing weak ferromagnetism below about TWF = 20 K. We suggest that frustrated spins in the molecular dimers suppress long-range order, forming a spin-glass ground state in the insulating phase.

References in corpus (15)

• Spin Liquid State in an Organic Mott Insulator with Triangular Lattice
• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• Theoretical Studies of Superconductor-Insulator Transitions
• Absence of charge order in the dimerized κ-phase BEDT-TTF salts
• Charge-cluster glass in an organic conductor
• Pressure-Tuned Exchange Coupling of a Quantum Spin Liquid in the Molecular Triangular Lattice $\kappa$-(ET)${}_2$Ag${}_2$(CN)${}_3$
• Quantum Spin Liquids Unveil the Genuine Mott State
• Quantum Melting of Charge Order due to Frustration in Two-Dimensional Quarter-Filled Systems
• Evidence for a quantum dipole liquid state in an organic quasi-two-dimensional material
• Lattice vibrations of the charge-transfer salt $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$: novel interpretation of the electrodynamic response in a spin-liquid compound
• On the multiferroic skyrmion-host GaV4S8
• Anions effects on the electronic structure and electrodynamic properties of the Mott insulator $\kappa$-(BEDT-TTF)${}_2$Ag${}_2$(CN)${}_3$
• Metal-Insulator Transition in the Dimerized Organic Conductor $\kappa$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$Br
• ESR studies on the spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$: anomalous response below $T=8$ K
• Quantum fluctuations, the Boson peak, and the glassy state of biomolecules

Cited by in corpus (9)

• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
• Impurity Moments Conceal Low-Energy Relaxation of Quantum Spin Liquids
• Melting of charge order in the low-temperature state of an electronic ferroelectric
• Special temperatures in frustrated ferromagnets
• Microscopic probe of magnetic polarons in antiferromagnetic Eu${}_5$In${}_2$Sb${}_6$
• Anomalously field-susceptible spin soft-matter emerging in an electric-dipole liquid candidate
• Charge glass in an extended dimer Hubbard model
• Surface excitations relaxation in the Kondo insulator Sm${}_{1-x}$Gd${}_x$B${}_6$
• ${}^{13}$C NMR observation of a nonmagnetic charge-ordered state in the organic conductor $\kappa$-(ET)${}_2$Hg(SCN)${}_2$Cl