Single-component molecular material hosting antiferromagnetic and spin-gapped Mott subsystems
Abstract
We investigated a system based solely on a single molecular species, Cu(tmdt)2, accommodating d and π orbitals within the molecule. 13C nuclear magnetic resonance measurements captured singlet-triplet excitations of π spins indicating the existence of a π-electron-based spin-gapped Mott insulating subsystem, which has been hidden by the large magnetic susceptibility exhibited by the d spins forming antiferromagnetic chains. The present results demonstrate a unique hybrid Mott insulator composed of antiferromagnetic and spin-singlet Mott subsystems with distinctive dimensionalities.
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