Magnetic excitations from an S=1/2 diamond-shaped tetramer compound Cu2PO4OH

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

doi:10.1103/PhysRevB.92.184428

Magnetic excitations from an S=1/2 diamond-shaped tetramer compound Cu2PO4OH

Materials Science 2015-12-09 v1

Authors: 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 width 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.

Keywords

magnetic excitations inelastic neutron scattering S=1/2 tetramer Heisenberg system Cu2PO4OH structural distortion intratetramer interaction

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@article{arxiv.1509.05424,
  title  = {Magnetic excitations from an S=1/2 diamond-shaped tetramer compound Cu2PO4OH},
  author = {M. Matsuda and S. E. Dissanayake and D. L. Abernathy and K. Totsuka and A. A. Belik},
  journal= {arXiv preprint arXiv:1509.05424},
  year   = {2015}
}

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6 pages, 6 figures

Magnetic excitations from an S=1/2 diamond-shaped tetramer compound Cu2PO4OH

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