Basic electronic properties of iron selenide under variation of structural parameters

Daniel Guterding, Harald Olaf Jeschke, Roser Valentí

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    Since the discovery of high-temperature superconductivity in the thin-film FeSe/SrTiO3 system, iron selenide and its derivates have been intensively scrutinized. Using ab initio density functional theory calculations we review the electronic structures that could be realized in iron selenide if the structural parameters could be tuned at liberty. We calculate the momentum dependence of the susceptibility and investigate the symmetry of electron pairing within the random phase approximation. Both the susceptibility and the symmetry of electron pairing depend on the structural parameters in a nontrivial way. These results are consistent with the known experimental behavior of binary iron chalcogenides and, at the same time, reveal two promising ways of tuning superconducting transition temperatures in these materials: on one hand by expanding the iron lattice of FeSe at constant iron-selenium distance and, on the other hand, by increasing the iron-selenium distance with unchanged iron lattice.

    Original languageEnglish
    Article number125107
    JournalPhysical Review B
    Volume96
    Issue number12
    DOIs
    Publication statusPublished - Sep 6 2017

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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