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We report the synthesis and characterization of a new quantum magnet[2-[Bis(2-hydroxybenzyl)aminomethyl]pyridine]Ni(II)-trimer (BHAP-Ni3) insingle-crystalline form. Our combined experimental and theoreticalinvestigations reveal an exotic spin state that stabilizes a robust 2/3magnetization plateau between 7 and 20 T in an external magnetic field.AC-susceptibility measurements show the absence of any magnetic order/glassystate down to 60 mK. The magnetic ground state is disordered and specific-heatmeasurements reveal the gapped nature of the spin excitations. Mostinterestingly, our theoretical modeling suggests that the 2/3 magnetizationplateau emerges due to the interplay between antiferromagnetic Heisenberg andbiquadratic exchange interactions within nearly isolated spin $S$ = 1triangles.

physical review. b./physical review. b

Pronounced 2/3 magnetization plateau in a frustrated $S$ = 1 isolated  spin-triangle compound: Interplay between Heisenberg and biquadratic exchange  interactions