Speaker
Description
CePtAl₄Ge₂ is a strongly correlated electron system that shows a Kondo coherence state below 6 K and long-range antiferromagnetic order below 2.3 K [1]. In CePtAl₄Ge₂, the magnetic moments in Ce sites are arranged in a two-dimensional triangular lattice, giving rise to magnetic frustration at low temperatures [2]. Previous studies have reported that the magnetic structure evolves under applied magnetic fields, with a strong dependence on field orientation [1,2]. In this study, we performed low-temperature electrical resistivity and magnetoresistance measurements under hydrostatic pressure to investigate pressure effects on the magnetic states. The antiferromagnetic phase transition temperature splits into two transitions above approximately 10 kbar, indicating the emergence of an additional pressure-induced ordered state. The complex field-induced magnetic phase diagram evolves under pressure, with a dependence on field direction. These results provide insight into the interplay between magnetic frustration and external pressure in CePtAl₄Ge₂, and suggest the emergence of an additional pressure-induced ordered state.
References
[1] Shin, Soohyeon, et al. "Synthesis and characterization of the heavy-fermion compound CePtAl4Ge2." Journal of Alloys and Compounds 738 (2018): 550-555.
[2] Shin, S., et al. "Magnetic structure and crystalline electric field effects in the triangular antiferromagnet CePtA l 4 G e 2." Physical Review B 101.22 (2020): 224421.
