Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2

Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2 We report detailed neutron scattering studies on Ba2Cu3O4Cl2. The compound consists of two interpenetrating sublattices of Cu, labeled as CuA and CuB, each of which forms a square-lattice Heisenberg antiferromagnet. The two sublattices order at different temperatures and effective exchange couplings within the sublattices differ by an order of magnitude. This yields an inelastic neutron spectrum of the CuA sublattice extending up to 300 meV and a much weaker dispersion of CuB going up to around 20 meV. Using a single-band Hubbard model we derive an effective spin Hamiltonian. From this, we find that linear spin-wave theory gives a good description to the magnetic spectrum. In addition, a magnetic field of 10 T is found to produce effects on the CuB dispersion that cannot be explained by conventional spin-wave theory. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2

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Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2

Abstract

We report detailed neutron scattering studies on Ba2Cu3O4Cl2. The compound consists of two interpenetrating sublattices of Cu, labeled as CuA and CuB, each of which forms a square-lattice Heisenberg antiferromagnet. The two sublattices order at different temperatures and effective exchange couplings within the sublattices differ by an order of magnitude. This yields an inelastic neutron spectrum of the CuA sublattice extending up to 300 meV and a much weaker dispersion of CuB going up to around 20 meV. Using a single-band Hubbard model we derive an effective spin Hamiltonian. From this, we find that linear spin-wave theory gives a good description to the magnetic spectrum. In addition, a magnetic field of 10 T is found to produce effects on the CuB dispersion that cannot be explained by conventional spin-wave theory.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.014410
Publisher site
See Article on Publisher Site

Abstract

We report detailed neutron scattering studies on Ba2Cu3O4Cl2. The compound consists of two interpenetrating sublattices of Cu, labeled as CuA and CuB, each of which forms a square-lattice Heisenberg antiferromagnet. The two sublattices order at different temperatures and effective exchange couplings within the sublattices differ by an order of magnitude. This yields an inelastic neutron spectrum of the CuA sublattice extending up to 300 meV and a much weaker dispersion of CuB going up to around 20 meV. Using a single-band Hubbard model we derive an effective spin Hamiltonian. From this, we find that linear spin-wave theory gives a good description to the magnetic spectrum. In addition, a magnetic field of 10 T is found to produce effects on the CuB dispersion that cannot be explained by conventional spin-wave theory.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 6, 2017

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