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

Matsuda, Masaaki; Dissanayake, Sachith E.; Abernathy, Douglas L.; Totsuka, K.; Belik, A. A.

doi:10.1103/PhysRevB.92.184428

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

Journal Article · Mon Nov 30 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.184428· OSTI ID:1286922

Matsuda, Masaaki ^[1]; Dissanayake, Sachith E. ^[1]; Abernathy, Douglas L. ^[1]; Totsuka, K. ^[2]; Belik, A. A. ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Kyoto Univ. (Japan)
National Inst. for Materials Science (NIMS), Tsukuba (Japan)

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 E₁~2 and E₂ ~0 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1286922

Alternate ID(s):: OSTI ID: 1227527

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 18; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Cited By (3)

Quantum magnetism in minerals Inosov, D. S. Advances in Physics, Vol. 67, Issue 3 https://doi.org/10.1080/00018732.2018.1571986	journal	July 2018
Twinned olivenite from Cap Garonne, Mine du Pradet – structure and magnetic behavior Kösters, Jutta; Paulsen, Christian; Stegemann, Frank Zeitschrift für Kristallographie - Crystalline Materials, Vol. 235, Issue 1-2 https://doi.org/10.1515/zkri-2019-0063	journal	February 2020
Quantum Magnetism in Minerals Inosov, D. S. arXiv https://doi.org/10.48550/arxiv.1806.10967	text	January 2018

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