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Magnetic excitations in iron chalcogenide superconductors
Hisashi Kotegawa1, Masaki Fujita2
1Department of Physics, Kobe University, Kobe 658-8530, Japan; JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan.
Science and Technology of Advanced Materials
|November 24, 2016
Summary
Magnetic excitations in iron chalcogenide superconductors reveal spin fluctuations are key to superconductivity. Variations in FeSe, FeSeTe, and alkali-metal-doped AFe2Se2 show distinct magnetic behaviors influencing their superconducting properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Iron chalcogenide superconductors exhibit complex magnetic excitations.
- Understanding the relationship between spin fluctuations and superconductivity is crucial.
- Existing research on FeSe, FeSeTe, and AFe2Se2 requires a comprehensive review.
Approach:
- Reviewed nuclear magnetic resonance and neutron scattering experiments.
- Surveyed magnetic excitations in FeSe, FeSe1-xTex, and alkali-metal-doped AFe2Se2.
- Analyzed the impact of stoichiometry, substitution, pressure, and doping on magnetic properties.
Key Points:
- In FeSe, spin fluctuations are intrinsically linked to superconductivity across various conditions.
- FeSe1-xTex shows a transition in magnetic ordering and spin fluctuation behavior with increasing Te content.
- Alkali-metal-doped AFe2Se2 compounds display distinct magnetic excitation characteristics compared to other iron-based superconductors.
Conclusions:
- FeSe1-xTex, across its composition range, aligns with other iron-based superconductors where spin fluctuations mediate superconductivity.
- The magnetic excitations in AFe2Se2 suggest an exceptional superconducting symmetry due to differences in Fermi surfaces and spin fluctuations.
- Spin fluctuation characteristics are critical determinants of superconductivity in iron chalcogenides.
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