De Haas–van Alphen Effect in Rh₂Ga₉and Ir₂Ga₉without Inversion Symmetry in the Crystal Structure and Related Compounds T₂Al₉(T: Co, Rh, Ir) with Inversion Symmetry

Superconductivity in the Endohedral Ga Cluster Compound PdGa5

“…4.6 Å; thus, direct Pd–Pd bonding is negligible. Such a situation is also found in other endohedral Ga cluster superconductors, such as Mo 8 Ga 41 , ,,, Mo 6 Ga 31 , , Mo 4 Ga 21 , , and TM 2 Ga 9 families. However in ReGa 5 , the Re–Re distance is clearly within the direct bonding range.…”

“…In the case of endohedral gallides, the highest T c values were reported for Mo 8 Ga 41 ( T c = 9.8 K) and Mo 6 Ga 31 ( T c = 8.0 K) with VEC ≈ 21.4 and 21.5 per transition metal atom, respectively . For a larger VEC, the critical temperatures are much lower, namely, T c = 2.3 K for ReGa 5 (VEC = 22) and T c = 2.0 for Rh 2 Ga 9 (VEC = 22.5). , …”

“…8 For a larger VEC, the critical temperatures are much lower, namely, T c = 2.3 K for ReGa 5 (VEC = 22) and T c = 2.0 for Rh 2 Ga 9 (VEC = 22.5). 7,8 PdGa 5 is an endohedral cluster compound that has 25 valence electrons and a mixed edge-and vertex-sharing manner of cluster connection. The unit cell of PdGa 5 with clusters of gallium around palladium atoms is shown in Figure 1.…”

“…Endohedral Ga cluster compounds constitute a family of superconductors that recently gained increased attention. − While crystal structures found in the TM x Ga y (TM, transition metal) compounds are diverse and rather complex, they can be conveniently described as networks of interconnected endohedral Ga clusters. Xie et al .…”

Fermi Surface of the Heavy-fermion Superconductor PrTi2Al20

“…The other dHvA-frequency branches, especially observed near d-, a-, and D-branches ranging from about 600 to 1000 T, are hard to identify the origins. These unidentified dHvA-frequency branches might originate from the orbital-crossing or magnetic-breakdown of the Fermi surfaces, which are frequently observed in the compounds with non-centrosymmetric crystal structure, such as Rh2Ga9, Ir2Ga9, 14) and Yb4Sb3. 15) These compounds possess the small but finite splitting of Fermi surfaces due to the antisymmetric spin-orbit interaction, and the orbital crossing at the degenerate points of the split Fermi surfaces was thought to be the origin of the observed many dHvA-frequency branches.…”