A spin-gapped Mott insulator with the dimeric arrangement of twisted molecules Zn(tmdt)${}_2$

Abstract

${}^{13}$C nuclear magnetic resonance measurements were performed for a single-component molecular material Zn(tmdt)${}_2$, in which tmdt's form an arrangement similar to the so-called $\kappa$-type molecular packing in quasi-two-dimensional Mott insulators and superconductors. Detailed analysis of the powder spectra uncovered local spin susceptibility in the tmdt $\pi$ orbitals. The obtained shift and relaxation rate revealed the singlet-triplet excitations of the $\pi$ spins, indicating that Zn(tmdt)${}_2$ is a spin-gapped Mott insulator with exceptionally large electron correlations compared to conventional molecular Mott systems.

14 pages, 6 figures

References in corpus (4)

• Single-Component Molecular Metals as Multiband π-d Systems
• Electronic States of Single-Component Molecular Conductors [M(tmdt)2]
• NMR Evidence for Antiferromagnetic Transition in the Single-Component Molecular System, [Cu(tmdt)${}_2$]
• Single-component molecular material hosting antiferromagnetic and spin-gapped Mott subsystems