Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 5: CE: Low-dimensional Systems - Materials 1
TT 5.10: Vortrag
Montag, 22. März 2010, 16:45–17:00, H18
The low-temperature structure of azurite — •Clare Gibson1,2, Kirrily Rule1, Manfred Reehuis1, Bachir Ouladdiaf3, Alan Tennant1,2, Stefan Suellow4, and Michael Lang5 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany — 2Institut für Festkörperphysik, TU Berlin, Berlin, Germany — 3Institut Laue-Langevin, Grenoble, France — 4Institut für Physik der Kondensierten Materie, TU Braunschweig, Germany — 5Phys. Inst., J.W. Goethe-Universität Frankfurt, Germany
The low-dimensional quantum magnet and natural mineral azurite, Cu3(CO3)2(OH)2, is considered to be a model of the distorted diamond chain lattice. Recently, much study has been devoted to determining the magnetic exchange parameters in this frustrated magnetic material. However, results have been contradictory [1,2,3] and the validity of the one-dimensional model has been called into question [4]. An accurate structural determination of azurite below the Nèel temperature may prove useful for the purpose of exchange parameter calculation in terms of precise knowledge of the magnetic superexchange pathways. We report on single crystal and powder neutron diffraction data taken over the temperature range 200 mK - 5 K to determine the low temperature lattice parameters and space group. Analysis reveals strain in the material which coincides with the magnetic ordering transition at 1.86 K.
[1] H. Kikuchi et al., Phys. Rev. Lett. 94, 227201 (2005)
[2] K.C. Rule et al., Phys. Rev. Lett. 100, 117202 (2008)
[3] G. Bo and G. Su, Phys. Rev. Lett. 97, 089701 (2006)
[4] J. Kang et al., J. Phys.: Condens. Matter 21, 392201 (2009)