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Intrinsic Charge Dynamics in High-T_{c} AFeAs(O,F) Superconductors.

A Charnukha1,2,3, D Pröpper3, N D Zhigadlo4,5

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Summary
This summary is machine-generated.

We determined the optical conductivity of iron oxypnictide superconductors PrFeAs(O,F) and SmFeAs(O,F). A novel collective mode was found in SmFeAs(O,F), indicating strong electron pairing.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • High-temperature superconductivity in iron oxypnictides (1111 materials) is crucial for advanced applications.
  • Understanding the electronic properties of single crystals versus thin films is essential for material optimization.

Purpose of the Study:

  • To determine the in-plane complex optical conductivity of PrFeAs(O,F) and SmFeAs(O,F) superconductors.
  • To investigate the differences in electronic coherence between single crystals and thin films.
  • To identify and characterize novel phenomena in the optical conductivity of these materials.

Main Methods:

  • Conventional and microfocused infrared spectroscopy.
  • Ellipsometry.
  • Time-domain THz transmission spectroscopy.
  • Temperature-dependent THz transmission measurements.

Main Results:

  • A significant difference in coherence was observed between single crystals and thin films.
  • A previously undetected 2.5-meV collective mode was identified in SmFeAs(O,F) optical conductivity.
  • This mode showed anomalous temperature dependence below approximately 110 K.
  • A large optical superconducting gap (2Δ/k_{B}T_{c}≈7) was found in both materials, suggesting strong pairing.

Conclusions:

  • The study provides the first in-plane optical conductivity data for these specific iron oxypnictides.
  • The discovered collective mode offers new insights into the exotic electronic behavior of SmFeAs(O,F).
  • The consistent large gap ratio indicates strong electron pairing in both single crystals and thin films.