It has already been demonstrated that a large variety of synthetic langbeinites, based on the structure of K₂Mg₂(SO₄)₃, can be stabilized with room temperature non-centrosymmetric structures . Chemically speaking, fully substituting both sulfate SO42- for phosphate PO43- group and diamagnetic Mg2+ ions for paramagnetic Cr3+ cations is possible only if a mixed counter cation (Na+A2+) is introduced on the potassium site. NaBa1-xSrxCr2(PO4)3 solids, ceramics, with x=0 and 1 were recently reported to show intriguing physical properties (hysteric magneto capacitance signal when x=0 and a parallel magnetic long range ordering when x=1). During this internship we aim to grow single crystals NaBa1-xSrxCr2(PO4)3, from high temperature solutions, because obtaining single crystals is mandatory to investigate the physical properties/nuclear structure relationships with respect to an external stimulus. This work is developed in the frame of a collaboration project which main goal is the search of multiferroics solids based on polyanionic framworks.

Combining superconductivity with topology in a material could lead to new types of quasiparticles such as Majorana zero modes and thus contribute to advances in the concept of quantum computing.

This PhD project aims to establish new kinds of topological quantum materials through crystal synthesis of candidate materials and the understanding of their physical properties.