Chasing the spin gap through the phase diagram of a frustrated Mott insulator

A. Pustogow (), Y. Kawasugi, H. Sakurakoji and N. Tajima
Additional contact information
A. Pustogow: Institute of Solid State Physics, TU Wien
Y. Kawasugi: Toho University
H. Sakurakoji: Toho University
N. Tajima: Toho University

Nature Communications, 2023, vol. 14, issue 1, 1-6

Abstract: Abstract The quest for entangled spin excitations has stimulated intense research on frustrated magnetic systems. For almost two decades, the triangular-lattice Mott insulator κ-(BEDT-TTF)2Cu2(CN)3 has been one of the hottest candidates for a gapless quantum spin liquid with itinerant spinons. Very recently, however, this scenario was overturned as electron-spin-resonance (ESR) studies unveiled a spin gap, calling for reevaluation of the magnetic ground state. Here we achieve a precise mapping of this spin-gapped phase through the Mott transition by ultrahigh-resolution strain tuning. Our transport experiments reveal a reentrance of charge localization below T⋆ = 6 K associated with a gap size of 30–50 K. The negative slope of the insulator-metal boundary, dT⋆/dp

Date: 2023
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DOI: 10.1038/s41467-023-37491-z

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