Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Correlated Electrons: Frustrated Magnets - Low-Dimensional Systems

TT 50.6: Vortrag

Mittwoch, 22. März 2017, 16:15–16:30, HSZ 304

The dynamics of linarite: Observations of magnetic excitations — Kirrily C. Rule¹, Britta Willenberg^2,3, Markus Schäpers⁴, Anja U.B. Wolter⁴, Stefan L. Drechsler⁴, Georg Ehlers⁵, Alan Tennant⁵, Richard Mole¹, Jason Gardner^6,7, •Stefan Süllow², and Satoshi Nishimoto^4,8 — ¹ANSTO, Kirrawee, Australia — ²IPKM, TU Braunschweig, Braunschweig, Germany — ³HZB für Materialien und Energie, Berlin, Germany — ⁴IFW Dresden, Dresden, Germany — ⁵ORNL, Oak Ridge, USA — ⁶NSRRC, Hsinchu, Taiwan — ⁷CCMS, National Taiwan University, Taipei, Taiwan — ⁸Dept. Physics, TU Dresden, Dresden, Germany

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 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.