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Updated: Dec 24, 2025
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
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Fluctuations and pairing in Fe-based superconductors: light scattering experiments.
1Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia.
Summary
Raman scattering reveals electronic and spin excitations in iron-based superconductors. This technique probes pair-breaking effects, collective modes, and critical fluctuations, offering insights into their complex correlated properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spectroscopy
Background:
- Inelastic light scattering, or Raman spectroscopy, is a powerful tool for investigating correlated electron systems.
- Fe-based pnictides and chalcogenides exhibit complex electronic and magnetic properties, including superconductivity, making them key targets for such studies.
Purpose of the Study:
- To review the application of Raman scattering to study electronic and spin excitations in Fe-based superconductors.
- To correlate observed phenomena with superconducting properties, electronic band structures, and magnetic fluctuations.
Main Methods:
- Inelastic light scattering (Raman spectroscopy) was employed to probe various excitations.
- Analysis of spectral features including pair-breaking effects, collective modes, and fluctuations in both superconducting and normal states.
Main Results:
- Superconducting gap energies were derived from pair-breaking effects, showing family-dependent variations.
- Collective modes, potentially exciton-like or quadrupolar orbital excitations, were observed in the superconducting state.
- Temperature-dependent fluctuations in the normal state were linked to resistivity and critical phenomena, with ongoing debate regarding their spin or charge origin.
Conclusions:
- Raman scattering provides crucial insights into the electronic, spin, and lattice dynamics of Fe-based superconductors.
- The observed excitations and fluctuations offer a detailed picture of the interplay between superconductivity, electronic correlations, and magnetic order.
- Further investigation is needed to fully resolve the nature of observed fluctuations and excitations.
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