Regensburg 2019 – wissenschaftliches Programm
MA 7.14: Vortrag
Montag, 1. April 2019, 18:45–19:00, H37
Robust modulated magnetic phases in lacunar spinel GaMo4S8 — •Ádám Butykai1, Dávid Szaller2, László Balogh1, László Ferenc Kiss3, Lisa DeBeer-Schmitt4, Hiroyuki Nakamura5, Sándor Bordács1, and István Kézsmárki1,6 — 1Department of Physics, Budapest University of Technology and Economics — 2Institute of Solid State Physics, Vienna University of Technology — 3Department of Experimental Solid State Physics, Wigner-MTA Research Centre for Physics — 4Oak Ridge National Laboratory — 5Department of Materials Science and Engineering, Kyoto University — 6Center for Electronic Correlations and Magnetism, University of Augsburg
Two members of the lacunar spinel crystal family, GaV4S8 and GaV4Se8, featuring a polar symmetry, have been reported to host Néel-type skyrmions [1,2]. Here, we present a provisional magnetic phase diagram for the 4d cluster magnet GaMo4S8, based on the combination of magnetization and small-angle neutron scattering experiments. GaMo4S8 is isostructural with the two other lacunar spinels, but exhibits a markedly stronger spin-orbit interaction. As a result, the periodicity of the magnetic modulations is found to be two times smaller, ∼ 10 nm, whereas the modulated magnetic phases extend from the Curie-temperature down to the lowest temperatures and show an extreme robustness against external fields up to 1.5-2 T.
 I. Kézsmárki et al., Nat. Mat., 14, 1116, (2015).  S. Bordács et al., Sci. Rep., 7, 7584, (2017).