Electronic structure of the 344-type superconductors La3(Ni;Pd)4(Si;Ge)4 by ab initio calculations

Abstract

Electronic structures of superconducting ternaries: La3Ni4Si4, La3Ni4Ge4, La3Pd4Si4, La3Pd4Ge4, and their non-superconducting counterpart, La3Rh4Ge4, have been calculated employing the full-potential local-orbital method within the density functional theory. Our investigations were focused particularly on densities of states (DOSs) at the Fermi level with respect to previous experimental heat capacity data, and Fermi surfaces (FSs) being very similar for all considered here compounds. In each of these systems, the FS originating from several bands contains both holelike and electronlike sheets possessing different dimensionality, in particular quasi-two-dimensional cylinders with nesting properties. A comparative analysis of the DOSs and FSs in these 344-type systems as well as in nickel (oxy)pnictide and borocarbide superconductors indicates rather similar phonon mechanism of their superconductivity.

arXiv comment10 pages, 5 figures

References in corpus (8)

• Nickel-based phosphide superconductor with infinite-layer structure, BaNi2P2
• Nesting properties and anisotropy of the Fermi surface of LuNi${}_2$B${}_2$C
• Nickel-based layered superconductor, LaNiOAs
• Density functional study of BaNi${}_2$As${}_2$: Electronic structure, phonons and electron-phonon superconductivity
• Ni${}_2$X${}_2$ (X=pnictide, chalcogenide, or B) Based Superconductors
• Electronic structure and Fermi surface character of LaONiP from first principles
• Low temperature specific heat of La_{3}Pd_{4}Ge_{4} with U_{3}Ni_{4}Si_{4}-type structure
• Electrical and magnetic properties of the new Kondo-lattice compound Ce3Pd4Ge4

Cited by in corpus (3)

• Electronic structure of non-centrosymmetric superconductor LaPdSi3 and its reference compound LaPdGe3
• The electronic structure of CeNiGe3 and YNiGe3 superconductors by ab initio calculations
• Evidence of s-wave superconductivity in ternary intermetallic La3Pd4Si4