Projekt

Daten zum Projekt

Synthesis, theoretical examination and experimental investigation of emergent iron-based superconductors

Initiative: Trilaterale Partnerschaften – Kooperationsvorhaben zwischen Wissenschaftler(inne)n aus der Ukraine, Russland und Deutschland (beendet)
Bewilligung: 29.02.2016
Laufzeit: 3 Jahre

Projektinformationen

The project will address the most emergent topics of iron pnictides and chalcogenides (FeSCs). It is planned to synthesize new crystals not studied so far and to study their unique physical properties. In particular, it is intended to continue the search for novel for metals charge collective excitations (indirect excitons) in related sister systems of KFe2As2, to investigate the superconducting order parameter and magnetism in these systems. The phase diagrams of Ba1-xAxFe2As2 (A=K,Cs,Rb), KFe2As2-CsFe2As2, NaFe2As2-RbFe2As2, KFe2As2-KFe2P2 and RbxFe2-ySe2-zSz substitution series will be investigated. By means of point contact spectroscopy in the normal state the compounds AFe2As2 with small Ba doping will be studied to identify the charge collective excitations which were discovered in KFe2As2. Using point contact Andreev reflections spectroscopy and the analog of the non-stationary Josephson Effect for point contacts (Shapiro steps), the change of the superconducting order parameter from s- to d- wave symmetries and the predicted intermediate s+id superconducting phase with time reversal broken symmetry will be searched for. In addition, the recently discovered C4- phase in alkali-doped BaFe2As2 will be investigated by means of Mössbauer and point contact spectroscopies. The expected experimental data will be analyzed within different theoretical model and approaches. This study will allow to make a significant step in understanding the triggering of the mechanism of superconductivity in unconventional Fe-SC.

Projektbeteiligte

  • Dr. Dmitri Efremov

    Leibniz-Institut für Festkörper- und
    Werkstoffforschung Dresden IFW
    Institut für Theoretische Festkörperphysik
    Dresden

  • Prof. Dr. Yurii Naidyuk

    National Academy of Sciences of Ukraine
    B. Verkin Institute for Low Temperature
    Physics and Engineering
    Kharkiv
    Ukraine

  • Dr. Igor Morozov

    Lomonosov Moscow State University
    Chemistry Department
    Inorganic Chemistry Division
    Moscow
    Russland

  • Dr. Stefan-Ludwig Drechsler

    Leibniz-Institut für Festkörper- und
    Werkstoffforschung Dresden IFW
    Institut fuer Theoretische Festkoerperphysik (ITF)
    Dresden

  • Dr. Sabine Wurmehl

    Leibniz-Institut für Festkörper- und
    Werkstoffforschung Dresden IFW
    Institut für Festkörperforschung
    Emmy Noether Group: "Heusler materials for
    spintronics"
    Dresden

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