Tuning of spin-orbit coupling in chiral molecule-incorporated two-dimensional organic-inorganic hybrid perovskite copper halides with ferromagnetic exchange interactions

Simultaneous control of noncentrosymmetry and spin-orbit-coupling strength has been demonstrated in a series of chiral molecule-incorporated two-dimensional organic-inorganic hybrid perovskite copper halides (2D-OIHPs) with ferromagnetic exchange interaction. By substituting the halogen from Cl to Br, a systematic change of the magnetic phase diagram from the simple ferromagnetic phase to complicated multiple phases has been observed. This change is due to competition between the ferromagnetic exchange interaction and the Dzyaloshinskii-Moriya interaction. Materials design focusing on the structural flexibility of 2D-OIHP could pave the way to developing new types of nontrivial topological spin systems.