Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 79: Correlated Electrons - Poster Session
TT 79.50: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P2
Magnetic anisotropy of azurite probed by high-field electron resonance — •Mykhaylo Ozerov, Jochen Wosnitza, and Sergei Zvyagin — Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
Electron spin resonance (ESR) studies of single crystals of the natural mineral azurite Cu3(CO3)2(OH)2, a spin-chain compound with a distorted diamond structure, in magnetic fields up to 16 T are reported. Two ESR modes were observed below TN = 1.8 K. The ESR angular dependence measured at 248 GHz revealed an extremum at a direction of 42o± 3o, tilted from the a axis towards to the c axis. Field dependence of the resonance frequencies was measured with magnetic fields applied parallel, as well as perpendicular, to this direction. Two gaps in the ESR excitation spectrum were found at 84 and 145 GHz (0.35 and 0.6 meV), which is consistent with results of inelastic neutron scattering measurements [Rule et al., PRB 84, 184419 (2011)]. Peculiarities of the obtained frequency-field diagram evidence essential role of the Dzyaloshinskii-Moriya interaction in the microscopic picture of the magnetic interactions in this compound.
This work was partly supported by the DFG.