Anomalous metallic behaviour in the doped spin liquid candidate κ-(ET)4Hg2.89Br8

Hiroshi Oike (), Yuji Suzuki, Hiromi Taniguchi, Yasuhide Seki, Kazuya Miyagawa and Kazushi Kanoda ()
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Hiroshi Oike: University of Tokyo
Yuji Suzuki: University of Tokyo
Hiromi Taniguchi: Saitama University
Yasuhide Seki: University of Tokyo
Kazuya Miyagawa: University of Tokyo
Kazushi Kanoda: University of Tokyo

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-00941-6

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