Inelastic neutron scattering study of the spin-gap cuprate β−AgCuPO4
Masashi Hase, Masaaki Matsuda, Kazuhisa Kakurai, Kiyoshi Ozawa, Hideaki Kitazawa, Naohito Tsujii, Andreas Dönni, Haruhiko Kuroe
DOI 10.1103/PhysRevB.76.134403 · Physical Review B
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Abstract
We studied magnetism of β−AgCuPO4 using inelastic neutron scattering and magnetic susceptibility measurements on powder samples. A well-defined asymmetric broad inelastic peak was observed at 6.2meV in constant-Q (scattering vector) scan spectra, indicating spin-gap excitation. From results of these measurements, we have obtained that the strongest exchange interaction exists in a Cu-O-P-O-Cu path in spite of the existence of Cu-O-Cu paths and that the antiferromagnetic alternating chain model with two exchange interaction values of 80 and 14K can explain the experimental results quantitatively. Our results are consistent with the prediction of Yahia et al. [Inorg. Chem. 45, 5501 (2006)].
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