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Superconductivity in alkali metal intercalated iron selenides
A Krzton-Maziopa1, V Svitlyk2, E Pomjakushina3
1Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, PL-00-664 Warsaw, Poland.
Summary
Alkali metal iron selenide superconductors exhibit unique properties due to iron vacancy ordering, leading to complex magnetic and superconducting behaviors. These materials showcase phase separation and intricate structure-property relationships.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Alkali metal intercalated iron selenide superconductors (AₓFe₂₋ᵧSe₂) display unique properties not observed in other superconductors.
- These compounds feature a layered structure with alkali metals intercalating FeSe layers.
Purpose of the Study:
- To review synthesis, crystal growth, structural, superconducting, and pressure-dependent properties of AₓFe₂₋ᵧSe₂.
- To elucidate the complex relationships between structure, magnetism, and superconductivity in these materials.
Main Methods:
- Review of experimental techniques used in studies over the last five years.
- Analysis of structural, magnetic, and superconducting properties.
- Investigation of behavior under applied pressure.
Main Results:
- Iron vacancies order below ~550 K, inducing antiferromagnetic ordering with a Néel temperature above room temperature.
- Phase separation occurs at lower temperatures, with one phase remaining magnetic and the other becoming superconducting below ~30 K.
- Iron vacancy ordering, long-range magnetic order, and mesoscopic phase separation are intrinsic properties.
Conclusions:
- The interplay between iron vacancy ordering, magnetism, and superconductivity is a key characteristic of AₓFe₂₋ᵧSe₂.
- Extensive research since 2010 has revealed complex structure-property relationships in these superconductors.
- Further investigation is warranted to fully understand the fundamental mechanisms governing their unique properties.
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