Triangular-Lattice Organic Mott Insulator with a Disorder-Free Polyanion

Shinya Tomeno; Mitsuhiko Maesato; Yukihiro Yoshida; Andhika Kiswandhi; Hiroshi Kitagawa

doi:10.1021/acs.inorgchem.0c00880

Triangular-Lattice Organic Mott Insulator with a Disorder-Free Polyanion

Inorg Chem. 2020 Jul 6;59(13):8647-8651. doi: 10.1021/acs.inorgchem.0c00880. Epub 2020 Jun 15.

Authors

Shinya Tomeno¹, Mitsuhiko Maesato¹, Yukihiro Yoshida¹, Andhika Kiswandhi^{1

2}, Hiroshi Kitagawa¹

Affiliations

¹ Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
² Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.

PMID: 32538624
DOI: 10.1021/acs.inorgchem.0c00880

Abstract

We report the synthesis, crystal and band structures, and transport properties of organic conductor κ-(ET)₂Cu[Au(CN)₂]Cl [ET = bis(ethylenedithio)tetrathiafulvalene], which has a triangular spin-lattice (S = ¹/₂) composed of (ET)₂^•+ dimers and polyanions with no disorder. The anisotropy of triangular lattice t'/t = 1.19 and physical properties indicate that this material is the first ET-based quantum-spin-liquid candidate having a nearly regular triangular lattice with a disorder-free anion.