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Fermi-surface reconstruction and complex phase equilibria in CaFe2As2.

K Gofryk1, B Saparov1, T Durakiewicz2

  • 1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

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|May 27, 2014
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Summary
This summary is machine-generated.

Fermi-surface topology changes significantly in CaFe2As2 during magnetic and collapsed-tetragonal transitions. These topological shifts impact the interplay between magnetism and superconductivity in iron-based superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • The Fermi-surface topology is crucial for understanding magnetism and superconductivity in iron-based materials.
  • CaFe2As2 exhibits complex phase transitions, including magnetic and structural changes, influencing its electronic properties.

Purpose of the Study:

  • To investigate the Fermi-surface reconstruction in CaFe2As2 during magnetic and collapsed-tetragonal (cT) transitions.
  • To elucidate the distinct topological changes associated with the cT transition and the effect of pressure on the electronic structure.

Main Methods:

  • Low-temperature transport measurements
  • Angle-resolved photoemission spectroscopy (ARPES)
  • X-ray diffraction (XRD)

Main Results:

  • Unambiguous evidence of significant Fermi-surface reconstruction at both magnetic and cT transitions in CaFe2As2.
  • The cT transition shows a distinct Fermi-surface topological change, notably without contribution from the hole part.
  • Pressure effects in CaFe2As2 primarily induce rigid-band-like alterations in the valence electronic structure.

Conclusions:

  • Fermi-surface topology plays a critical role in the magnetic and superconducting properties of CaFe2As2.
  • The distinct topological changes during the cT transition offer insights into the mechanisms driving these phases.
  • Understanding these electronic structure modifications is key to designing novel iron-based superconductors.