Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 32: Spin Structures and Magnetic Phase Transitions
MA 32.9: Vortrag
Mittwoch, 18. März 2015, 17:15–17:30, EB 202
High-frequency electron spin resonance studies on the antiferromagnetic phase of A3Ni2SbO6 (A = Li, Na) — Jaena Park1, •Changhyun Koo1, Michael Tzschoppe1, Maria A. Evstigneeva2, Vladimir B. Nalbandyan2, Elena A. Zvereva3, and Rüdiger Klingeler1 — 1Kirchhoff Institute for Physics, Heidelberg University, Heidelberg, Germany. — 2Chemistry Faculty, Southern Federal University, Rostov-na-Donu, Russia. — 3Faculty of Physics, Moscow State University, Moscow, Russia.
High-frequency electron spin resonance (HF-ESR) and static magnetization studies have been used to study the antiferromagnetically ordered phase in the layered honeycomb antimonates A3Ni2SbO6 (A = Li, Na). Antiferromagnetic resonance (AFMR) branches are observed below Neel temperature of both compounds, 15 K and 17 K, respectively, and the frequency-magnetic field phase diagram of the AFMRs is constructed. Above the Neel temperature, all AFMR branches merge to a single resonance mode. The frequency field diagram allows reading off the zero-field splitting which amounts to about 200 GHz and 360 GHz, respectively. The spin-flop field is extracted both from the static magnetization and the AFMR data. Analyzing the AFMR modes by means of spin wave theory provides estimates of the exchange field and of the magnetic anisotropy in the antiferromagnetic phase of both compounds.