Field-induced staggered magnetic moment in the quasi-two-dimensional organic Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Cl

Abstract

We investigated the magnetism under a magnetic field in the quasi-two-dimensional organic Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Cl through magnetization and ${}^{13}$C-NMR measurements. We found that in the nominally paramagnetic phase (i.e., above Néel temperature) the field-induced local moments have a staggered component perpendicular to the applied field. As a result, the antiferromagnetic transition well defined at a zero field becomes crossover under a finite field. This unconventional behavior is qualitatively reproduced by the molecular-field calculation for Hamiltonian including the exchange, Dzyaloshinsky-Moriya (DM), and Zeeman interactions. This calculation also explains other unconventional magnetic features in $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Cl reported in the literature. The present results highlight the importance of the DM interaction in field-induced magnetism in a nominally paramagnetic phase, especially in low-dimensional spin systems.

arXiv comment11 pages, 12 figures, selected for Editors' Suggestions

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Cited by in corpus (17)

• Anomalous Hall effect in $\kappa$-type organic antiferromagnets
• Importance of Spin-Orbit Coupling in Organic BEDT-TTF and BEDT-TSF Salts
• Critical Spin Liquid versus Valence Bond Glass in Triangular Lattice Organic $\kappa$-(ET)${}_2$Cu${}_2$(CN)${}_3$
• Quasi-continuous transition from a Fermi liquid to a spin liquid
• $ab$-$initio$ Approaches for Low-Energy Spin Hamiltonians
• Electron spin dynamics of two-dimensional layered materials
• Dynamical reduction of the dimensionality of exchange interactions and the "spin-liquid" phase of $\kappa$-(BEDT-TTF)${}_{2}X$
• Heisenberg and Dzyaloshinskii-Moriya interactions controlled by molecular packing in tri-nuclear organometallic clusters
• Magneto-optical spectra of an organic antiferromagnet as a candidate for an altermagnet
• Charge disproportionation in the spin-liquid candidate $\kappa$-(ET)${}_2$Cu${}_2$(CN)${}_3$ at 6 K revealed by ${}^{63}$Cu NQR measurements
• Magnetic critical properties and basal-plane anisotropy of Sr${}_2$IrO${}_4$
• Staggered Spin Order of Localized pi-electrons in the Insulating State of the Organic Conductor kappa-BETS)2Mn[N(CN)2]3
• Anomalously field-susceptible spin soft-matter emerging in an electric-dipole liquid candidate
• Two-dimensional magnetism in kappa-(BEDT-TTF)2Cu[N(CN)2]Cl, a spin-1/2 Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interaction
• Impact of the Dzyaloshinskii-Moriya interaction in strongly correlated itinerant systems
• Antiferromagnetic ordering of organic Mott insulator $\lambda$-(BEDSe-TTF)${}_2$GaCl${}_4$
• Persistence of fermionic spin excitations through a genuine Mott transition in $\kappa$-type organics