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キーワード:
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要旨:
Open-shell solids exhibit a plethora of intriguing physical phenomena
that arise from a complex interplay of charge, spin, orbital, and
spin-state degrees of freedom. Comprehending these phenomena is an
indispensable prerequisite for developing improved functional materials.
This type of understanding can be achieved, on the one hand, by
experimental and theoretical investigations into known systems, or by
synthesizing new solids displaying unprecedented structural and/or
electronic features. -Ag3RuO4 may serve as such a model system because
it possesses a remarkable anionic structure, consisting of tetrameric
polyoxoanions (Ru4O16)(12-), and is an embedded fragment of a 2D
trigonal MO2 lattice. The notorious frustration of antiferromagnetic
(AF) exchange couplings on such lattices is thus lifted, and instead
strong AF occurs within the oligomeric anion, where only one exchange
path remains frustrated among the relevant six. The strong magnetic
anisotropy of the [Ru4O16](12-) ion, and the effectively orbital nature
of its net magnetic moment, implies that this anion may reveal the
properties of a single-molecule magnet if well-diluted in a diamagnetic
matrix.
