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Report No.

Magnetic excitations in spin gap system

Kakurai, Kazuhisa; Matsuda, Masaaki; Hase, Masashi*; Ozawa, Kiyoshi*; Kitazawa, Hideaki*; Tsujii, Naoto*; Doenni, A.*; Hu, X.*; Kuroe, Haruhiko*

We report powder sample inelastic neutron scattering experiments on spin gap systems. Recently the magnetization plateau phenomenon in quantum spin systems are drawing attention of both theoretical and experimental physicists. Although the relevant exchange energies can be estimated from the magnetic susceptibility measurements assuming some theoretical models, we can only speculate the exchange interaction scheme causing the singlet ground state based on the structural and bonding information. We shall present examples of powder sample inelastic neutron scattering studies on the antiferromagnetic alternating chain system $$beta$$-AgCuPO$$_{4}$$ and trimer chain compound Cu$$_{3}$$(P$$_{2}$$O$$_{6}$$OD)$$_{2}$$ using triple axis spectrometer at the steady state neutron source and stress that this kind of research on novel quantum systems could be very effectively performed using the low-energy chopper type spectrometer being built for the J-PARC spallation neutron source.



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