Abstract
Quantum spin liquids are exotic Mott insulators that carry extraordinary spin excitations. Therefore, when doped, they are expected to afford metallic states with unconventional magnetic excitations. Here, we report experimental results which are suggestive of a doped spin liquid with anomalous metallicity in a triangular-lattice organic conductor. The spin susceptibility is nearly perfectly scaled to that of a non-doped spin liquid insulator in spite of the metallic state. Furthermore, the charge transport that is confined in the layer at high temperatures becomes sharply deconfined on cooling, coinciding with the rapid growth of spin correlations or coherence as signified by a steep decrease in spin susceptibility. The present results substantiate the desired doped spin liquid and suggest a strange metal, in which the coherence of the underlying spin liquid promotes the deconfinement of charge from the layers while preserving the non-Fermi-liquid nature.
Highlights
Quantum spin liquids are exotic Mott insulators that carry extraordinary spin excitations
The present results suggest the realization of a doped spin liquid that hosts a non-Fermi liquid in a triangular-lattice organic conductor
To assess the spin liquid nature of κ-HgBr in the doped Mott insulator regime, we measured the spin susceptibility χspin (Fig. 2a). It is characterized by a linear temperature dependence at high temperatures and a rounded peak at 30–40 K, followed by a sharp decrease, which is consistent with earlier reports[16, 17]
Summary
Quantum spin liquids are exotic Mott insulators that carry extraordinary spin excitations. We report experimental results which are suggestive of a doped spin liquid with anomalous metallicity in a triangular-lattice organic conductor. The Hg ions form a sub-lattice incommensurate with the Br and ET sub-lattice This results in a fixed non-stoichiometric composition of 2.8913, and the deficiency from 3.0 causes 11% hole doping in the half-filled band in the conducting layer. We describe the results of spin susceptibility and resistivity measurements, which probe the spin and charge sectors of the doped triangular-lattice organic conductor κ-HgBr. The spin susceptibility in the doped Mott insulator regime is nearly perfectly scaled to that of a non-doped spin liquid insulator, indicating that the spin sector of κ-HgBr behaves like spin liquid in spite of the metallic state. The present results suggest the realization of a doped spin liquid that hosts a non-Fermi liquid in a triangular-lattice organic conductor
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