Rare-Earth and Actinide Science Research Group

The Rare-earth and Actinides Science Research Group delves into the realm of quantum materials, focusing on the unique and fascinating properties of materials where f-electrons play a pivotal role. Rare-earth materials (4f electrons) and actinides (5f electrons) exhibit extraordinary phenomena due to inherent strong electronic correlations and pronounced spin-orbit coupling. These include unconventional superconductivity, heavy-fermion behavior, diverse magnetic phases, exceptionally large magnetic anisotropies, making them essential for advancing fundamental research. The exceptional properties of f-electron systems underpin their versatility in various applications, such as permanent magnets, magnetocaloric devices, and magnetic storage technologies (Fig. 1). Additionally, rare-earth and actinide compounds show high efficiency in hydrogen absorption, positioning them as promising candidates for hydrogen storage.

Description

Fig. 1: Illustrations of spin arrangements in the cubic and tetragonally-strained UO₂ and the magnetic exchange bias effect in the UO₂/Fe₃O₄ bilayers resulting from magnetic configurations in the antiferromagnetic UO₂ (from E. Tereshina-Chitrova et al., Advanced Functional Materials 2311895 (2024).

Our research encompasses both thin films and bulk single crystals, utilizing a wide range of experimental techniques for microscopic and macroscopic characterization. The studies frequently involve extreme conditions, including high magnetic fields, low temperatures, and high pressures, enabling us to probe and understand the distinctive properties of f-electron systems under diverse stimuli.

We actively collaborate with leading national and international institutions, advancing the understanding of emergent phenomena in quantum materials and driving progress in this dynamic field.

In addition, our group is responsible for the stewardship of nuclear materials for the Institute of Physics.