EPR study of the two-dimensional quantum magnet Cu(en)(H2O)2SO4


EPR study of the two-dimensional quantum magnet Cu(en)(H2O)2SO4

Tarasenko, R.; Orendácová, A.; Cizmár, E.; Orendác, M.; Zvyagin, S.; Wosnitza, J.

Electron paramagnetic resonance (EPR) spectra of Cu(en)(H2O)2SO4 (en = ethylendiamine) single crystals were measured in the X-band range at temperatures 4 K and 300 K in magnetic fields up to 0.5 T. The angular dependence of the g-factor and EPR linewidths were studied. The analysis of the g-factor confirmed, that coordinating ligands around the Cu(II) ion form a distorted octahedron elongated along the local z axis and the distortion is maintained down to low temperatures. The increase of the linewidth observed at low temperatures can be ascribed to the onset of short-range magnetic correlations previously observed in specic heat studies. The reduction of the period in the angular dependence of the linewidth observed at 4 K cannot be explained by the existence of two crystallographic non-equivalent Cu(II) positions. The analysis of the angular dependence of the linewidth suggests the potential occurence of Dzyaloshinski-Moriya interaction and anisotropic exchange coupling in CUEN.

  • Poster
    The European Conference Physics of Magnetism 2011 (PM´11), 27.06.-01.07.2011, Poznan, Poland

Permalink: https://www.hzdr.de/publications/Publ-15912
Publ.-Id: 15912