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      Dynamical Reduction of the Dimensionality of Exchange Interactions and the “Spin-Liquid” Phase of \(\kappa \) - \((\mathrm{BEDT}\text{−}\mathrm{TTF}{)}_{2}X\)

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      Physical Review Letters

      American Physical Society (APS)

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          Spin liquids in frustrated magnets.

           L. Balents (2010)
          Frustrated magnets are materials in which localized magnetic moments, or spins, interact through competing exchange interactions that cannot be simultaneously satisfied, giving rise to a large degeneracy of the system ground state. Under certain conditions, this can lead to the formation of fluid-like states of matter, so-called spin liquids, in which the constituent spins are highly correlated but still fluctuate strongly down to a temperature of absolute zero. The fluctuations of the spins in a spin liquid can be classical or quantum and show remarkable collective phenomena such as emergent gauge fields and fractional particle excitations. This exotic behaviour is now being uncovered in the laboratory, providing insight into the properties of spin liquids and challenges to the theoretical description of these materials.
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            Is Open Access

            Spin Liquid State in an Organic Mott Insulator with Triangular Lattice

            \(^{1}\)H NMR and static susceptibility measurements have been performed in an organic Mott insulator with nearly isotropic triangular lattice, \(\kappa\)-(BEDT-TTF)\(_{2}\)Cu\(_{2}\)(CN)\(_{3}\), which is a model system of frustrated quantum spins. The static susceptibility is described by the spin \(S\) = 1/2 antiferromagnetic triangular-lattice Heisenberg model with the exchange constant \(J\) \(\sim\) 250 K. Regardless of the large magnetic interactions, the \(^{1}\)H NMR spectra show no indication of long-range magnetic ordering down to 32 mK, which is four-orders of magnitude smaller than \(J\). These results suggest that a quantum spin liquid state is realized in the close proximity of the superconducting state appearing under pressure.
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              Thermodynamic properties of a spin-1/2 spin-liquid state in a κ-type organic salt

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                Author and article information

                Journal
                PRLTAO
                Physical Review Letters
                Phys. Rev. Lett.
                American Physical Society (APS)
                0031-9007
                1079-7114
                August 2017
                August 25 2017
                : 119
                : 8
                10.1103/PhysRevLett.119.087204
                © 2017

                https://link.aps.org/licenses/aps-default-license

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