Journal
JETP LETTERS
Volume 92, Issue 11, Pages 751-755Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0021364010230074
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Funding
- Russian Foundation for Basic Research [11-02-00147]
- Russian Academy of Sciences [09-P-2-1009]
- Division of Physical Sciences, Russian Academy of Sciences [09-T-2-1011]
- Ural and Siberian Branches, Russian Academy of Sciences [09-C-2-1009]
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The electronic structure of the recently discovered superconductor SrPt2As2 with T-c = 5.2 K has been calculated in the local-density approximation. Despite its chemical composition and crystal structure are somehow similar to FeAs-based high-temperature superconductors, the electronic structure of SrPt2As2 is very much different. The crystal structure is orthorhombic (or tetragonal if idealized) and has layered nature with alternating PtAs4 and AsPt4 tetrahedra slabs sandwiched with Sr ions. The Fermi level is crossed by Pt-5d states with rather strong admixture of As-4p states. Fermi surface of SrPt2As2 is essentially three-dimensional, with complicated sheets corresponding to multiple bands. We compare SrPt2As2 with 1111 and 122 representatives of FeAs-class of superconductors, as well as with isovalent (Ba,Sr)Ni2As2 superconductors. Brief discussion of superconductivity in SrPt2As2 is also presented.
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