Magnetic excitations in an S= 12 diamond-shaped tetramer compound Cu2PO4OH

M. Matsuda, S. E. Dissanayake, D. L. Abernathy, K. Totsuka, A. A. Belik

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Abstract

Inelastic neutron scattering experiments have been carried out on a powder sample of Cu2PO4OH, which consists of diamond-shaped tetramer spin units with S=1/2. We have observed two nearly dispersionless magnetic excitations at E1∼12 and E2∼20 meV whose energy widths are broader than the instrumental resolution. The simplest square tetramer model with one dominant interaction, which predicts two sharp excitation peaks at E1 and E2 (=2E1), does not explain the experimental result. We found that two diagonal intratetramer interactions compete with the main interaction, and weak intertetramer interactions connect the tetramers. The main intratetramer interaction is found to split into two inequivalent ones due to a structural distortion below 160 K. Cu2PO4OH is considered to be a good material to study the S=1/2 Heisenberg tetramer system.

Original languageEnglish
Article number184428
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number18
DOIs
StatePublished - 2015

Funding

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