La6Pd2+xSb15 (x = 0.28): A rare-earth palladium intermetallic compound with extended pnictogen ribbons

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Mihai I. Sturza - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • M. Lourdes Amigó - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Jorge I. Facio - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Federico Caglieris - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Saicharan Aswartham - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Silvia Seiro - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Christian Hess - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Jeroen van den Brink - , Chair of Solid State Theory, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Sabine Wurmehl - , Leibniz Institute for Solid State and Materials Research Dresden, TUD Dresden University of Technology (Author)
  • Bernd Büchner - , Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)

Abstract

A new intermetallic ternary compound La6Pd2.28Sb15 was synthesized from the reaction of lanthanum and palladium metals in a molten antimony flux. The compound crystallizes in the orthorhombic space group Immm with a ​= ​4.3082(9) Å, b ​= ​15.399(3) Å and c ​= ​19.689(4) Å. The crystal structure contains a three-dimensional framework of Sb squares and ribbons that extend along the a axis, including complex Sb–Sb bonding. La6Pd2.28Sb15 is diamagnetic, with a magnetic susceptibility weakly dependent on temperature (T). The resistivity (ρ) decreases when lowering the temperature, indicating metallic behavior, and at low temperatures ρ depends quadratically on T. Interestingly, both the Hall resistivity and magnetoresistance present a nonlinear dependence on the applied magnetic field, suggesting a multiband behavior. This is supported by density-functional electronic structure calculations which show a complex Fermi surface originated in the antimonide substructures and containing both electron and hole pockets as well as open sheets.

Details

Original languageEnglish
Article number121578
JournalJournal of solid state chemistry
Volume291
Publication statusPublished - Nov 2020
Peer-reviewedYes

Keywords

Keywords

  • Electronic structure calculations, Hall resistivity, Intermetallic, Magnetoresistance, p-type metallic, Single crystal X-ray diffraction