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arXiv · 1611.00986

The dynamics of linarite: Observations of magnetic excitations

K. C. Rule·B. Willenberg·M. Schäpers·A. U. B. Wolter·B. Büchner·S. -L. Drechsler·G. Ehlers·D. A. Tennant·R. A. Mole·J. S. Gardner·S. Süllow·S. Nishimoto
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Abstract

Here we present inelastic neutron scattering measurements from the frustrated, quantum spin-1/2 chain material linarite, PbCuSO_4(OH)_2. Time of flight data, taken at 0.5K and zero applied magnetic field reveals low-energy dispersive spin wave excitations below 1.5meV both parallel and perpendicular to the Cu-chain direction. From this we confirm that the interchain couplings within linarite are around 10% of the nearest neighbour intrachain interactions. We analyse the data within both linear spin-wave theory and density matrix renormalisation group theories and establish the main magnetic exchange interactions and the simplest realistic Hamiltonian for this material.

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K. C. Rule, B. Willenberg, M. Schäpers, A. U. B. Wolter, B. Büchner, S. -L. Drechsler, G. Ehlers, D. A. Tennant, R. A. Mole, J. S. Gardner, S. Süllow, S. Nishimoto. 2016-11-03. The dynamics of linarite: Observations of magnetic excitations. https://doi.org/10.1103/physrevb.95.024430

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