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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 )

Abstract

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.

Authors:
 [1];  [2];  [3];  [1]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Lab. for Neutron Scattering and Imaging
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Lab. for Multiscale Materials Experiments
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1484096
Alternate Identifier(s):
OSTI ID: 1483918
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetism

Citation Formats

Furrer, A., Podlesnyak, A., Pomjakushina, E., and Pomjakushin, V. Spin triplet ground-state in the copper hexamer compounds A2Cu3O(SO4)3(A=Na,K). United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.180410.
Furrer, A., Podlesnyak, A., Pomjakushina, E., & Pomjakushin, V. Spin triplet ground-state in the copper hexamer compounds A2Cu3O(SO4)3(A=Na,K). United States. doi:10.1103/PhysRevB.98.180410.
Furrer, A., Podlesnyak, A., Pomjakushina, E., and Pomjakushin, V. Thu . "Spin triplet ground-state in the copper hexamer compounds A2Cu3O(SO4)3(A=Na,K)". United States. doi:10.1103/PhysRevB.98.180410. https://www.osti.gov/servlets/purl/1484096.
@article{osti_1484096,
title = {Spin triplet ground-state in the copper hexamer compounds A2Cu3O(SO4)3(A=Na,K)},
author = {Furrer, A. and Podlesnyak, A. and Pomjakushina, E. and Pomjakushin, V.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.98.180410},
journal = {Physical Review B},
number = 18,
volume = 98,
place = {United States},
year = {2018},
month = {11}
}

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