Emergence of inhomogeneous moments from spin liquid in the triangular-lattice Mott insulator $\kappa$-(ET)${}_2$Cu${}_2$(CN)${}_3$

Abstract

The static and dynamic local spin susceptibility of the organic Mott insulator $\kappa$-(ET)${}_2$Cu${}_2$(CN)${}_3$, a model material of the spin- 1/2 triangular lattice, is studied by ${}^{13}$C NMR spectroscopy from room temperature down to 20 mK. We observe an anomalous field-dependent spectral broadening with the continuous and bipolar shift distribution, appearing without the critical spin fluctuations. It is attributable to spatially nonuniform magnetizations induced in the spin liquid under magnetic fields. The amplitude of the magnetization levels off below 1 K, while the low-lying spin fluctuations survive toward the ground state, as indicated by the temperature profile of the relaxation rates.

4 pages, 4 figures

References in corpus (2)

• U(1) Gauge Theory of the Hubbard Model : Spin Liquid States and Possible Application to k-(BEDT-TTF)_2 Cu_2 (CN)_3
• Mott Transition from a Spin Liquid to a Fermi Liquid in the Spin-Frustrated Organic Conductor kappa-(ET)2Cu2(CN)3

Cited by in corpus (10)

• Excitation spectra of the spin-1/2 triangular-lattice Heisenberg antiferromagnet
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• Spin-orbit effects in Na${}_4$Ir${}_3$O${}_8$, a hyper-kagomé lattice antiferromagnet
• Global phase diagrams of frustrated quantum antiferromagnets in two dimensions: doubled Chern-Simons theory
• Dynamics and transport of the Z_2 spin liquid: application to kappa-(ET)2Cu2(CN)3
• Theory of quantum impurities in spin liquids
• Field-induced staggered magnetic moment in the quasi-two-dimensional organic Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Cl
• Insulator-metal transition on the triangular lattice
• X-ray Irradiation-induced Carrier Doping Effects in Organic Dimer-Mott Insulators
• Exotic gapless spectrum induced by frustration in quantum antiferromagnets