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Title: Coupled antiferromagnetic spin- 1 2 chains in green dioptase Cu 6 [ Si 6 O 18 ] · 6 H 2 O

In this paper, we report inelastic neutron scattering measurements of the magnetic excitations of green dioptase Cu 6[Si 6O 18]∙6H 2O. 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- 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
Authors:
 [1] ; ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR), Spallation Neutron Source; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1239762
Alternate Identifier(s):
OSTI ID: 1238964; OSTI ID: 1261517

Podlesnyak, Andrey A, Larry M. Anovitz, Kolesnikov, Alexander I, Matsuda, Masaaki, Prisk, Timothy R, Toth, Sandor, and Ehlers, Georg. Coupled antiferromagnetic spin- 12 chains in green dioptase Cu6[Si6O18]·6H2O. United States: N. p., Web. doi:10.1103/PhysRevB.93.064426.
Podlesnyak, Andrey A, Larry M. Anovitz, Kolesnikov, Alexander I, Matsuda, Masaaki, Prisk, Timothy R, Toth, Sandor, & Ehlers, Georg. Coupled antiferromagnetic spin- 12 chains in green dioptase Cu6[Si6O18]·6H2O. United States. doi:10.1103/PhysRevB.93.064426.
Podlesnyak, Andrey A, Larry M. Anovitz, Kolesnikov, Alexander I, Matsuda, Masaaki, Prisk, Timothy R, Toth, Sandor, and Ehlers, Georg. 2016. "Coupled antiferromagnetic spin- 12 chains in green dioptase Cu6[Si6O18]·6H2O". United States. doi:10.1103/PhysRevB.93.064426. https://www.osti.gov/servlets/purl/1239762.
@article{osti_1239762,
title = {Coupled antiferromagnetic spin- 12 chains in green dioptase Cu6[Si6O18]·6H2O},
author = {Podlesnyak, Andrey A and Larry M. Anovitz and Kolesnikov, Alexander I and Matsuda, Masaaki and Prisk, Timothy R and Toth, Sandor and Ehlers, Georg},
abstractNote = {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- 12Hamiltonian 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=14.5K<c, and can be explained by a presence of quantum spin fluctuations},
doi = {10.1103/PhysRevB.93.064426},
journal = {Physical Review B},
number = 6,
volume = 93,
place = {United States},
year = {2016},
month = {2}
}