2014/09/25 by Motoharu Imai, Soshi Ibuka, Naoki Kikugawa +5 · 21 citations
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Crystallography #Debye model #Electrical resistivity and conductivity #Iron-based superconductors research #Magnetic susceptibility #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Superconductivity #Superconductivity in MgB2 and Alloys #Type (biology) #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.91.014513
published in Physical Review B 91(1) (American Physical Society) · 24 pages, 9 figures
arxiv created 2014/09/25 · openalex publication_date 2015/01/30 · arxiv updated 2015/02/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The crystal structure, superconducting properties, and electronic structure of the novel superconducting 122-type antimonide BaPt2Sb2 have been studied by measurements of powder x-ray diffraction patterns, electrical resistivity, ac magnetic susceptibility, specific heat, and by ab initio calculations. The material crystallizes in a new monoclinic variant of the CaBe2Ge2-type structure, in which Pt2Sb2 layers that consist of PtSb4 tetrahedra, and Sb2Pt2 layers that consist of SbPt4 tetrahedra, are stacked alternatively, with Ba atoms located between them. Measurements of electrical resistivity, ac magnetic susceptibility, and specific heat revealed that BaPt2Sb2 is a superconducting material with a critical temperature of 1.8 K. The electronic heat capacity coefficient and the Debye temperature were 8.6(2)\phantom\rule0.16em0exmJ/mol\phantom\rule0.16em0exK2 and 146(4) K, respectively. The upper critical field and the Ginzburg-Landau coherent length were determined to be 0.27 T and 35 nm, respectively. The calculations showed that the material has two three-dimensional Fermi surfaces (FSs) and two two-dimensional FSs, leading to anisotropic transport properties. The d states of the Pt atoms in the Pt2Sb2 layers are the main contributors to the density of states at the Fermi level. A comparison between experimental and calculated results indicates that BaPt2Sb2 is a superconducting material with moderate coupling.