Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.59: Poster
Donnerstag, 29. März 2012, 15:00–19:00, Poster B
Magnetic excitations in the diamond spin system Cu3(CO3)2(OH)2 probed by ESR — •Dmytro Kamenskyi1, Mykhaylo Ozerov1, Frederik Wolff-Fabris1, Joachim Wosnitza1, Sonia Francoual2, Vivien Zapf3, and Sergei Zvyagin1 — 1Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), 01328 Dresden, Germany — 2Hamburger Synchrotronstrahlungslabor (HASYLAB), Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany — 3National High Magnetic Field Laboratory - Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
We report systematic tunable-frequency electron spin resonance (ESR) studies of the natural mineral azurite Cu3(CO3)2(OH)2. This material has a diamond spin-chain structure and exhibits unusual magnetic properties (including a magnetization plateau). ESR experiments have been done at frequencies from 50 to 1000 GHz in magnetic fields up to 51 T. The observed frequency-field dependence of the magnetic excitations clearly indicates the important role of magnetic frustrations in this material, which can be suppressed by high magnetic fields. Our findings are discussed in connection with results of inelastic neutron-scattering experiments. Work was supported by EuroMagNET II (EU contract No. 228043).