Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 18: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 2 (jointly with MA)
TT 18.11: Vortrag
Montag, 16. März 2015, 17:45–18:00, H 3005
Field Induced Phases and Possible Multimagnon Bound States in the Frustrated Quantum Spin Chain Linarite — Britta Willenberg1, Manfred Reehuis1, Markus Schäpers2, Anja U.B. Wolter2, Stefan.-Ludwig Drechsler2, Satoshi Nishimoto2, Bernd Büchner2, Kirrily C. Rule3, Bachir Ouladdiaf3, and •Stefan Süllow4 — 1HZ Berlin, Berlin, Germany — 2IFW Dresden, Dresden, Germany — 3The Bragg Institute, ANSTO, Australia — 4IPKM, TU Braunschweig, Braunschweig, Germany
A neutron diffraction and NMR study of the field induced phases of linarite PbCuSO4(OH)2 is presented for magnetic fields H ∥ b axis at temperatures down to 1.7 K. A two step spin flop transition is observed, transforming the helical magnetic ground state into a collinear structure. As well, a magnetic phase with sine-wave modulated moments parallel to the field direction was detected, enclosing the other long-range ordered phases. The propagation vector of this 3D spin density wave phase shifts with increasing magnetic field. Theoretical calculations imply that linarite possesses an xyz exchange anisotropy. Within this model a coexistence of 2-, 3-, and 4- magnon bound states is predicted to be present in linarite.