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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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Nonexponential London penetration depth of FeAs-based superconducting RFeAsO(0.9)F(0.1) (R = La, Nd) single crystals.

C Martin1, M E Tillman, H Kim

  • 1Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA.

Physical Review Letters
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

Superconducting penetration depth measurements in RFeAsO(0.9)F(0.1) single crystals reveal a T-squared dependence after accounting for magnetic effects. This finding, consistent across La and Nd variants, supports unconventional two-gap superconductivity in pnictide superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • The superconducting penetration depth (λ(T)) is a crucial parameter for understanding the electronic properties of superconductors.
  • Iron-based superconductors, such as the R-1111 family, exhibit complex behaviors that require detailed investigation.

Purpose of the Study:

  • To measure and analyze the temperature-dependent superconducting penetration depth in RFeAsO(0.9)F(0.1) (R = La, Nd) single crystals.
  • To investigate the underlying superconducting mechanism, particularly the presence of multiple gaps.

Main Methods:

  • Experimental measurement of the superconducting penetration depth, λ(T), in single crystals of RFeAsO(0.9)F(0.1) (R = La, Nd).
  • Analysis of the temperature dependence of λ(T), including corrections for magnetic ion contributions.
  • Investigation of superfluid density and penetration depth anisotropy.

Main Results:

  • An upturn in λ(T) was observed in Nd-1111, attributed to Nd ion paramagnetism.
  • After correcting for paramagnetism, a T-squared power-law dependence (ΔλL(T) ∝ T²) was found at low temperatures for both La-1111 and Nd-1111.
  • Analysis indicated consistency with two-gap superconductivity across the full temperature range.

Conclusions:

  • The observed T-squared dependence of the penetration depth supports unconventional superconductivity in R-1111 materials.
  • The findings, combined with previous work on R-1111 and R-122 families, strongly suggest unconventional two-gap superconductivity in iron-based pnictide superconductors.