Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.37: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Spin dynamics in Azurite: high-field ESR studies — •M. Ozerov1, D. Kamenskyi1, J. Wosnitza1, H. Engelkamp2, F. Wolff-Fabris3, S. Francoual4, M. Jaime5, and S. Zvyagin1 — 1Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden - Rossendorf, Germany — 2High Field Magnet Laboratory, Institute for Molecules and Materials, Radboud University, 6525 ED Nijmegen, The Netherlands — 3European XFEL GmbH, 22607 Hamburg, Germany — 4Deutsches Elektronen-Synchrotron DESY, Hasylab Petra III, 22607 Hamburg, Germany — 5MPA-CMMS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
The natural mineral azurite (Cu3(CO3)2(OH)2), a spin-1/2 chain system with a distorted diamond structure, has been probed by means of electron spin resonance and far-infrared spectroscopy in magnetic fields up to 50 T. The observed spectra revealed a very complex picture of magnetic excitations including the co-existence of monomer and dimer excitations, as well as their high-energy bound states. The observation of the bound monomer-dimer states is of particular importance, illuminating the limitation of the simple isolated dimer-monomer chain model employed for the description of magnetic properties of Azurite previously. The peculiarities of the resonance absorption in Azurite are discussed.
This work was partly supported by the DFG and EuroMagNET (EU contract No. 228043).