PuPt2In7: a computational and experimental investigation

الأصل · EN

Flux-grown single crystals of PuPt₂In₇ are characterized and found to be both non-superconducting and non-magnetic down to 2 K. The Sommerfeld specific heat coefficient of 250 mJ/mol K² indicates heavy fermion behavior. We report the results of generalized gradient approximation (GGA)+U calculations of PuPt₂In₇ and as yet unsynthesized isovalent PuPt₂Ga₇. The strength of the c-f hybridization of PuPt₂In₇ is similar to the PuCoIn₅ superconductor. The bare and f-weighted susceptibility within the constant-matrix-element approximation is calculated, showing a maximum along the qz direction at qₓ = qy = 0.5. A similar and slightly stronger maximum is also found in the structurally related heavy-fermion materials PuCoGa₅ and PuCoIn₅. The absence of superconductivity in PuPt₂In₇ is examined based on the results of our calculations.