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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Strong coupling theory for superconducting iron pnictides.

Wei-Qiang Chen1, Kai-Yu Yang, Yi Zhou

  • 1Department of Physics, the University of Hong Kong, Hong Kong, China.

Physical Review Letters
|March 5, 2009
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Summary

This study explores superconductivity in iron pnictides using a two-orbital Hubbard model. It reveals that Coulomb repulsion drives orbital-dependent pairing, influencing superconductivity symmetry based on Hund

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Superconductivity in iron pnictides is a complex phenomenon.
  • Understanding the underlying mechanisms is crucial for developing new superconducting materials.
  • The role of electron-electron interactions, specifically Coulomb repulsion, is a key area of investigation.

Purpose of the Study:

  • To investigate superconductivity in iron pnictides using a two-orbital Hubbard model.
  • To analyze the impact of Coulomb repulsion and Hund's coupling on pairing symmetry.
  • To compare theoretical predictions with experimental findings.

Main Methods:

  • Utilized a two-orbital Hubbard model in the large Coulomb repulsion (U) limit.
  • Analyzed orbital-dependent pairing mechanisms.
  • Investigated interpocket pair scattering effects on superconductivity symmetry.

Main Results:

  • Coulomb repulsion induces orbital-dependent pairing between charge carriers.
  • Pairing primarily occurs within the same Fermi pocket.
  • Superconductivity symmetry transitions from extended s-wave (small Hund's coupling) to d-wave (large Hund's coupling and U).

Conclusions:

  • The study provides a theoretical framework for understanding superconductivity in iron pnictides.
  • The predicted extended s-wave symmetry aligns with experimental observations from angle-resolved photoemission spectroscopy and Andreev reflection spectroscopy.
  • Hund's coupling and large U are critical parameters determining the superconducting state's symmetry.