Browsing by Author "Tennant, DA"

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    Dynamics of linarite: observations of magnetic excitations
    (American Physical Society, 2017-01-26) Rule, KC; Willenberg, B; Schäpers, M; Wolter, AUB; Büchner, B; Drechsler, SL; Ehlers, G; Tennant, DA; Mole, RA; Gardner, JS; Süllow, S; Nishimoto, S
    Here we present inelastic neutron scattering measurements from the frustrated, quantum spin-1/2 chain material linarite, PbCuSO4(OH)2. Time of flight data, taken at 0.5 K and zero applied magnetic field reveals low-energy dispersive spin wave excitations below 1.5 meV 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 neighbor intrachain interactions. We analyze the data within both linear spin-wave theory and density matrix renormalization group theories and establish the main magnetic exchange interactions and the simplest realistic Hamiltonian for this material. ©2017 American Physical Society.