Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: CE: Low-dimensional Systems - Materials 2
TT 22.3: Vortrag
Dienstag, 15. März 2011, 11:00–11:15, HSZ 304
Magnetic coupling and dynamics in the 1D quantum magnet azurite Cu3(CO3)2(OH)2 as determined from inelastic neutron scattering. — •Kirrily Rule1, Alan Tennant1,2, Mark Telling3, Sebastian Gerischer1, Stefan Suellow4, and Michael Lang5 — 1Helmholtz-Zentrum Berlin, Berlin, Germany — 2Institut fuer Festkoerperphysik, TU Berlin, Berlin, Germany — 3ISIS, Rutherford Appleton Laboratories, Chilton, UK — 4Institut fuer Physik der Kondensierten Materie, TU Braunschweig, Braunschweig, Germany — 5Goethe Universitat, Frankfurt(M), SFB/TR 49, Germany
Low dimensional magnetic systems, in particular, copper oxides are interesting subjects of study due to the novel physics that can arise in such systems at low temperatures. Both a natural mineral and quantum magnet, Cu3(CO3)2(OH)2 is a candidate model of the so-called Distorted Diamond Chain system. Early studies of this material imply the presence of an ordered antiferromagnetic phase below TN ∼ 1.9 K while magnetization measurements have revealed a 1/3 magnetization plateau. Most recently the interactions and magnetic exchange couplings have been hotly debated. We will present our analysis of the inelastic neutron scattering data, highlighting the temperature and field dependence of the low energy spin chain excitations. We will also reveal information about the as yet unseen higher energy magnetic excitations. Finally we would like to consolidate this data by presenting a model to describe this intriguing 1D quantum magnet.