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TT: Fachverband Tiefe Temperaturen
TT 5: CE: Low-dimensional Systems - Materials 1
TT 5.9: Vortrag
Montag, 22. März 2010, 16:30–16:45, H18
Effective spin-chain model for azurite: comparison with experimental results (exchanged with TT 5.8) — •Andreas Honecker1, Robert Peters1, Thomas Pruschke1, Roser Valentí2, Harald Jeschke2, Ingo Opahle2, Hem Kandpal2, Tanusri Saha-Dasgupta3, Hena Das3, Johannes Richter4, Helge Rosner5, Oleg Janson5, Shijie Hu6, Xiaoqun Wang6, Bernd Wolf2, and Michael Lang2 — 1Institut für Theoretische Physik, Georg-August-Universität Göttingen — 2Johann Wolfgang Goethe-Universität Frankfurt am Main — 3Bose National Centre for Basic Sciences, Kolkata — 4Institut für Theoretische Physik, Otto-von-Guericke Universität Magdeburg — 5Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden — 6Department of Physics, Renmin University of China, Beijing
We analyze a spin-1/2 Heisenberg model with a generalized diamond chain exchange geometry which has been derived from ab-initio computations for the mineral azurite Cu3(CO3)2(OH)2. Using numerical results, we demonstrate that a consistent description can be obtained for various physical properties of azurite: (i) the low-temperature magnetization curve, (ii) inelastic neutron scattering on the 1/3 magnetization plateau, (iii) nuclear magnetic resonance measurements on the 1/3 magnetization plateau, and (iv) the magnetic susceptibility as well as the specific heat. Our results resolve previous controversies on the modeling of azurite. Furthermore, we explain why a one-dimensional model can be used in many situations although interchain exchange in azurite is actually non-negligible at a microscopic level.