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.

arXiv comment14 pages, 6 figures

References in corpus (5)

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