Coupled antiferromagnetic spin- 12 chains in green dioptase Cu6[Si6O18]·6H2O

Podlesnyak, Andrey A; Kolesnikov, Alexander I; Matsuda, Masaaki; Prisk, Timothy R; Toth, Sandor; Ehlers, Georg

doi:10.1103/PhysRevB.93.064426

Title: Coupled antiferromagnetic spin- $\frac{1}{2}$ chains in green dioptase ${Cu}_{6} [{Si}_{6} O_{18}] \cdot 6 H_{2} O$

Journal Article · Mon Feb 01 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.064426· OSTI ID:1239762

Podlesnyak, Andrey A ^[1]; Kolesnikov, Alexander I ^[1]; Matsuda, Masaaki ^[1]; Prisk, Timothy R ^[1]; Toth, Sandor ^[2]; Ehlers, Georg ^[1]

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

In this paper, we report inelastic neutron scattering measurements of the magnetic excitations of green dioptase Cu₆[Si₆O₁₈]∙6H₂O. The observed spectrum contains two magnetic modes and a prominent spin gap that is consistent with the ordered ground state of Cu moments coupled antiferromagnetically in spiral chains along the c axis and ferromagnetically in ab planes on the hexagonal cell. The data are in excellent agreement with a spin- $\frac{1}{2}$ Hamiltonian that includes antiferromagnetic nearest-neighbor intrachain coupling J_c=10.6(1) meV, ferromagnetic interchain coupling J_ab=₋1.2 (1) meV, and exchange anisotropy ΔJ_c=0.14(1) meV. We calculated the sublattice magnetization to be strongly reduced, ~0.39μ_B. This appears compatible with a reduced Néel temperature, T_N=14.5K<_c, and can be explained by a presence of quantum spin fluctuations

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR), Spallation Neutron Source; 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:: 1239762

Alternate ID(s):: OSTI ID: 1238964; OSTI ID: 1261517

Journal Information:: Physical Review B, Vol. 93, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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References (17)

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Neutron Instruments for Research in Coordination Chemistry: Neutron Instruments for Research in Coordination Chemistry Xue, Zi-Ling; Ramirez-Cuesta, Anibal J.; Brown, Craig M. European Journal of Inorganic Chemistry, Vol. 2019, Issue 8 https://doi.org/10.1002/ejic.201801076	journal	January 2019
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Title: Coupled antiferromagnetic spin- $\frac{1}{2}$ chains in green dioptase ${Cu}_{6} [{Si}_{6} O_{18}] \cdot 6 H_{2} O$