Evolution of T-H phase Diagram in Ce_1-xPr_xOs₄Sb₁₂ and comparison with pressure study in CeOs₄Sb₁₂

The filled skutterudite CeOs₄Sb₁₂ is a heavy-fermion compensated semimetal that exhibits a spin-density-wave type antiferromagnetic phase below ~1 K. Theoretical predictions suggested it may possess a topologically protected state with coexisting electron and hole Fermi surfaces at low temperatures. Previous studies have revealed a near-spherical Fermi surface above 28 T, an enhancement of cyclotron mass below 35 T, and a valence transition with a distinctive reverse wedge-shaped temperature (T) versus magnetic field (H) phase diagram [1,2,3]. Substituting Pr for Ce potentially introduces more hole carriers. This report examines the effects of Pr substitution on the electronic properties, the evolution of T-H phase diagram, and carrier density in Ce_1-xPr_xOs₄Sb₁₂ before the emergence of superconductivity, and compares these findings with the pressure studies in CeOs₄Sb₁₂ [1].

References: [1] K. Götze et. al, New J. Phys. 24, 043044 (2022). [2] K. Götze et. al, PRB 101, 075102 (2020). [3] P.-C. Ho et. al, PRB 94, 205140 (2016).