Dresden 2017 – wissenschaftliches Programm
MA 44.8: Vortrag
Mittwoch, 22. März 2017, 17:00–17:15, HSZ 403
Spectroscopic investigation of a spin liquid (RVB) state and local distortions in the frustrated spin-1/2 Copper Carbodiimide (CuNCN) — Azat Sharafeev1, Vladimir Gnezdilov2, •Peter Lemmens1, Xiaohui Liu3, Andrei Tchougreeff3, and Richard Dronskowski3 — 1TU-BS, Braunschweig — 2ILTP, Kharkov — 3RWTH Aachen
In CuNCN there exist corrugated layers of Cu2+ bridged by NCN2- groups with a square planar Cu2+ coordination. Based on very large AF exchange and frustration a nonmagnetic ground state is observed. On the other side, some evidence for hidden magnetic order with strong fluctuations typical for low dimensionality has been given. We critically discuss the presently known scenarios on the basis of Raman scattering data, giving evidence for local lattice distortions for T<60K as well as high energy excitations. Work supported by RTG-DFG 1952/1, the Laboratory for Emerging Nanometrology, TU Braunschweig, and NTH Contacs in Nanosystems.