Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Poster Ib: Magnetic Materials (1-14); Micro Magnetism/Computational Mag. (15-17); Surface Magnetism (18-22); Spin Structures/Phase Transitions (23-25)

MA 14.24: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1B

Magnetic excitations and ordering in azurite — •Clare Gibson¹, Kirrily Rule¹, Stefan Süllow², Alan Tennant¹, Jens-Uwe Hoffmann¹, and Mark Telling³ — ¹Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany — ²Institut für Physik der Kondensierten Materie, TU Braunschweig, D-38106 Braunschweig, Germany — ³ISIS, Chilton, Oxfordshire, UK

Azurite, Cu3(CO3)2(OH)2 realises a distorted diamond chain with a 1/3-magnetisation phase. A combination of time-of-flight spectroscopy and polarized neutron scattering has been used to elucidate the excitation spectrum in the sub-plateau phase. Not only does the excitation spectrum prove the dynamics of the system to be one-dimensional but also reveals a highly unusual interplay of excitations. A lower mode comprises unconventional continua and an upper mode consists of dimer excitations combined with spinons. In addition to the study of the dynamics, we propose a magnetic structure for the ordered phase below T=1.86K.