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Structure and superconductivity in LnNi2B2C: comparison of calculation and experiment

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
119
Issue
12
Identifiers
DOI: 10.1016/s0038-1098(01)00295-2
Keywords
  • A. Superconductors
  • A. Metals
  • C. Crystal Structure And Symmetry
Disciplines
  • Physics

Abstract

Abstract The experimental relation between the superconducting transition temperature ( T c) and lattice size for the lanthanide nickel borocarbides is clarified. The electronic density of states (DOS) at the Fermi energy is calculated by the LMTO method for selected non-magnetic lanthanides. The T c and the DOS are both shown to scale in the same way with a structural parameter that characterizes the bond angle in the NiB 4 tetrahedra. The results strongly support arguments that the suppression of superconductivity on going from smaller to larger lanthanides in the quaternary nickel borocarbides is structurally driven. A structure– T c relationship of this type is unusual for intermetallic superconductors.

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