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• W2093407961 abstract "We studied magnetism of two cuprates using inelastic neutron scattering and magnetization measurements on powder samples. A spin gap of 6.2meV (72K) was observed in β-AgCuPO4. The spin system was determined as a spin-1∕2 twofold-period (alternating) antiferromagnetic (AF) chain with two exchange interaction values of 80 and 14K. Contrary to common knowledge, the strongest exchange interaction exists in a Cu–Cu bond with the distance of 5.20Å in spite of the existence of short Cu–Cu bonds. Cu3(P2O6OD)2 is known to have a spin-1∕2 threefold-period chain with J1-J2-J2 interactions, where J1 and J2 denote two AF exchange interaction parameters, showing a 1∕3 magnetization plateau. A spin gap of 9.8meV (114K) was found, which generated the magnetization plateau. The gap corresponds to a singlet-triplet-like excitation of an AF dimer formed by the dominant J1 interaction. We determined that J1=111K and J2=30K." @default.
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• W2093407961 date "2008-01-24" @default.
• W2093407961 modified "2023-09-27" @default.
• W2093407961 title "Neutron scattering studies of spin-1∕2 twofold-period (alternating) and threefold-period quantum antiferromagnetic chains" @default.
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• W2093407961 doi "https://doi.org/10.1063/1.2830527" @default.
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