Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.18: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
ESR studies of the S = 1/2 ladder compound Cu(Qnx)Cl2 — •A. Ponomaryov1, M. Ozerov1, E. Čižmár2, J. Wosnitza1, K. Povarov3, A. Zheludev3, A. Zvyagin4, and S. Zvyagin1 — 1High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Institute of Physics, P.J. Šafárik University, Košice, Slovakia — 3Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH Zürich, Switzerland — 4Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine
By means of electron spin resonance we systematically studied Cu(Qnx)Cl2 (Qnx - quinoxaline), a Heisenberg S = 1/2 spin-ladder compound with Jleg = 18.6 K and Jrung= 34.2 K. The linewidth, g-factor shift, and absorption intensity were investigated in the temperature range from 2 to 300 K. The low-temperature measurements revealed an ESR line splitting, which is a signature of a finite anisotropy. The observed results were analyzed using mean-field theory. The uniform Dzyaloshinskii-Moriya interaction was suggested to play a key role, strongly affecting the ESR properties of this compound at low temperature.
The work was partly supported by the DFG.