Spin triplet ground-state in the copper hexamer compounds A2Cu3O(SO4)3(A=Na,K)

Furrer, A.; Podlesnyak, A.; Pomjakushina, E.; Pomjakushin, V.

doi:10.1103/PhysRevB.98.180410

Title: Spin triplet ground-state in the copper hexamer compounds $A_{2} C u_{3} O {(S O_{4})}_{3} (A = Na, K)$

Journal Article · Thu Nov 29 00:00:00 EST 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.180410· OSTI ID:1484096

Furrer, A. ^[1]; Podlesnyak, A. ^[2]; Pomjakushina, E. ^[3]; Pomjakushin, V. ^[1]

Paul Scherrer Inst. (PSI), Villigen (Switzerland). Lab. for Neutron Scattering and Imaging
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Paul Scherrer Inst. (PSI), Villigen (Switzerland). Lab. for Multiscale Materials Experiments

The compounds $${A}_{2}\mathrm{C}{\mathrm{u}}_{3}\mathrm{O}{(\mathrm{S}{\mathrm{O}}_{4})}_{3}(A=\mathrm{Na},\mathrm{K})$$ are characterized by copper hexamers which are weakly coupled along the $$b$$ axis to realize one-dimensional antiferromagnetic chains below $${T}_{\mathrm{N}}{\approx}3\mathrm{K}$$, whereas the interchain interactions along the $$a$$ and $$c$$ axes are negligible. Here we investigated the energy-level splittings of the copper hexamers by inelastic neutron scattering below and above $${T}_{\mathrm{N}}$$. The eight lowest-lying hexamer states could be unambiguously assigned and parametrized in terms of a Heisenberg exchange Hamiltonian, providing direct experimental evidence for an $S=1$ triplet ground-state associated with the copper hexamers. Therefore, the compounds $${A}_{2}\mathrm{C}{\mathrm{u}}_{3}\mathrm{O}{(\mathrm{S}{\mathrm{O}}_{4})}_{3}$$ serve as cluster-based spin-1 antiferromagnets to support Haldane's conjecture that a gap appears in the excitation spectrum below $${T}_{\mathrm{N}}$$, which was verified by inelastic neutron scattering.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Paul Scherrer Inst. (PSI), Villigen (Switzerland)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1484096

Alternate ID(s):: OSTI ID: 1483918

Journal Information:: Physical Review B, Vol. 98, Issue 18; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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References (15)

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Cited By (4)

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
Cluster-based Haldane phases, bound magnon crystals and quantum spin liquids of a mixed spin-1 and spin-1/2 Heisenberg octahedral chain Karl'ová, Katarína; Strečka, Jozef; Verkholyak, Taras Physical Review B, Vol. 100, Issue 9 https://doi.org/10.1103/physrevb.100.094405	journal	September 2019
Quantum Magnetism in Minerals Inosov, D. S. arXiv https://doi.org/10.48550/arxiv.1806.10967	text	January 2018
Cluster-based Haldane phases, bound magnon crystals and quantum spin liquids of a mixed spin-1 and spin-1/2 Heisenberg octahedral chain Karlova, Katarina; Strecka, Jozef; Verkholyak, Taras arXiv https://doi.org/10.48550/arxiv.1904.02889	text	January 2019

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Title: Spin triplet ground-state in the copper hexamer compounds A 2 C u 3 O ( S O 4 ) 3 ( A = Na , K )

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Title: Spin triplet ground-state in the copper hexamer compounds $A_{2} C u_{3} O {(S O_{4})}_{3} (A = Na, K)$