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

A. Podlesnyak; L. M. Anovitz; A. I. Kolesnikov; M. Matsuda; T. R. Prisk; S. Toth; G. Ehlers

doi:10.1103/PhysRevB.93.064426

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

A. Podlesnyak, L. M. Anovitz, A. I. Kolesnikov, M. Matsuda, T. R. Prisk, S. Toth, G. Ehlers

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Abstract

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-12 Hamiltonian that includes antiferromagnetic nearest-neighbor intrachain coupling Jc=10.6(1) meV, ferromagnetic interchain coupling Jab=-1.2(1) meV, and exchange anisotropy ΔJc=0.14(1) meV. We calculated the sublattice magnetization to be strongly reduced, ∼0.39μB. This appears compatible with a reduced Néel temperature, TN=14.5KJc, and can be explained by a presence of quantum spin fluctuations.

Original language	English
Article number	064426
Journal	Physical Review B
Volume	93
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.93.064426
State	Published - Feb 23 2016

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10.1103/PhysRevB.93.064426

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

abstract = "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-12 Hamiltonian that includes antiferromagnetic nearest-neighbor intrachain coupling Jc=10.6(1) meV, ferromagnetic interchain coupling Jab=-1.2(1) meV, and exchange anisotropy ΔJc=0.14(1) meV. We calculated the sublattice magnetization to be strongly reduced, ∼0.39μB. This appears compatible with a reduced N{\'e}el temperature, TN=14.5KJc, and can be explained by a presence of quantum spin fluctuations.",

author = "A. Podlesnyak and Anovitz, {L. M.} and Kolesnikov, {A. I.} and M. Matsuda and Prisk, {T. R.} and S. Toth and G. Ehlers",

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doi = "10.1103/PhysRevB.93.064426",

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T1 - Coupled antiferromagnetic spin- 12 chains in green dioptase Cu6[Si6O18]·6H2O

AU - Podlesnyak, A.

AU - Anovitz, L. M.

AU - Kolesnikov, A. I.

AU - Matsuda, M.

AU - Prisk, T. R.

AU - Toth, S.

AU - Ehlers, G.

PY - 2016/2/23

Y1 - 2016/2/23

N2 - 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-12 Hamiltonian that includes antiferromagnetic nearest-neighbor intrachain coupling Jc=10.6(1) meV, ferromagnetic interchain coupling Jab=-1.2(1) meV, and exchange anisotropy ΔJc=0.14(1) meV. We calculated the sublattice magnetization to be strongly reduced, ∼0.39μB. This appears compatible with a reduced Néel temperature, TN=14.5KJc, and can be explained by a presence of quantum spin fluctuations.

AB - 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-12 Hamiltonian that includes antiferromagnetic nearest-neighbor intrachain coupling Jc=10.6(1) meV, ferromagnetic interchain coupling Jab=-1.2(1) meV, and exchange anisotropy ΔJc=0.14(1) meV. We calculated the sublattice magnetization to be strongly reduced, ∼0.39μB. This appears compatible with a reduced Néel temperature, TN=14.5KJc, and can be explained by a presence of quantum spin fluctuations.

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

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