SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 4: Focus Session: Correlated van-der-Waals Magnets
TT 4.7: Vortrag
Montag, 27. September 2021, 15:45–16:00, H7
Probing magnetic states in 2D layered van-der- Waals materials under pressure — Anirudha Gosh1, Deobrat Singh1, Qingge Mu2, Sergey Medvedev2, Rajeev Ahuja1, Olle Eriksson1, and •Mahmoud Abdel-Hafiez1 — 1Uppsala University, Department of Physics and Astronomy, Box 516, SE-751 20 Uppsala, Sweden — 2Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
Two-dimensional van der Waals materials offer a plethora of functional properties that are not only of fundamental interest but are essential for the development of new technological applications. Through combined complementary experimental techniques supplemented with theoretical calculations on high quality CrI3 single crystals, we derive a previously not discussed pressure-temperature phase diagram. TC increases to ~ 66 K with pressure up to ~ 3 GPa and then decreases to ~ 10 K at 21.2 GPa. The origin of this behavior is associated with a decrease in the calculated bond angle from 95^o at ambient pressure to ~ 85^o at 25 GPa. At a pressure above ~ 22 GPa, the magnetically ordered state is highly quenched, possibly driving the system to a Kitaev spin-liquid state at low temperature. Pressure-dependent Raman and resistivity measurements also reveal suppression of the phonon modes and semiconductor to metal transition, respectively above ~ 22 GPa. Furthermore, we will describe our recent experiments on CrCl3 single crystals.