Spin-coupling topology in the copper hexamer compounds A2Cu3O(SO4)3 (A=Na, K) SPIN-COUPLING TOPOLOGY in the COPPER HEXAMER ... A. FURRER et al.

A. Furrer; A. Podlesnyak; J. M. Clemente-Juan; E. Pomjakushina; H. U. Güdel

doi:10.1103/PhysRevB.101.224417

Spin-coupling topology in the copper hexamer compounds A₂Cu₃O(SO₄)₃ (A=Na, K) SPIN-COUPLING TOPOLOGY in the COPPER HEXAMER ... A. FURRER et al.

A. Furrer, A. Podlesnyak, J. M. Clemente-Juan, E. Pomjakushina, H. U. Güdel

Direct Geometry

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Abstract

The compounds A₂Cu₃O(SO₄)3 (A=Na,K) are characterized by copper hexamers that are weakly coupled to realize antiferromagnetic order below TN≈3K. They constitute quantum spin systems with S=1 triplet ground states. We investigated the energy-level splittings of the copper hexamers by inelastic neutron scattering experiments covering the entire range of the magnetic excitation spectra. The observed transitions are governed by very unusual selection rules that we ascribe to the underlying spin-coupling topology. This is rationalized by model calculations that allow an unambiguous interpretation of the magnetic excitations concerning both the peak assignments and the nature of the spin-coupling parameters.

Original language	English
Journal	Physical Review B
Volume	101
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.101.224417
State	Published - Jun 1 2020

Funding

We thank V. Pomjakushin (Paul Scherrer Institut, Switzerland) for useful discussions on the structural aspects. J.M.C.-J. acknowledges the support by the Spanish MINECO (CTQ2017-89528-P). This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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abstract = "The compounds A2Cu3O(SO4)3 (A=Na,K) are characterized by copper hexamers that are weakly coupled to realize antiferromagnetic order below TN≈3K. They constitute quantum spin systems with S=1 triplet ground states. We investigated the energy-level splittings of the copper hexamers by inelastic neutron scattering experiments covering the entire range of the magnetic excitation spectra. The observed transitions are governed by very unusual selection rules that we ascribe to the underlying spin-coupling topology. This is rationalized by model calculations that allow an unambiguous interpretation of the magnetic excitations concerning both the peak assignments and the nature of the spin-coupling parameters.",

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Spin-coupling topology in the copper hexamer compounds A₂Cu₃O(SO₄)₃ (A=Na, K) SPIN-COUPLING TOPOLOGY in the COPPER HEXAMER ... A. FURRER et al.

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