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Andreev reflection spectroscopy of the new Fe-based superconductor EuAsFeO0.85F0.15: Evidence of strong anisotropy in the order parameter
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10.1063/1.3590753
/content/aip/journal/ltp/37/4/10.1063/1.3590753
http://aip.metastore.ingenta.com/content/aip/journal/ltp/37/4/10.1063/1.3590753
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Resistive transition to the superconducting state in the EuAsFeO0.85F0.15 compound investigated here.

Image of FIG. 2.
FIG. 2.

Two typical one-gap dI/dV(V) spectra of Au-EuAsFeO0.85F0.15 point contacts (solid lines—experiment, dashed lines—BTK fitting) differing in gap size and degree of smearing of the spectral lines (fitting parameter Г). 1/RN ≈ 0.25 S, Δ ≈ 1.3 meV, Г ≈ 0.01 meV, Z ≈ 0.1 (a); 1/RN  ≈ 0.14 S, Δ ≈ 3.1 meV, Г ≈ 1.8 meV, Z ≈ 0.15 (b).

Image of FIG. 3.
FIG. 3.

Two examples of dI/dV(V) spectra that can be fitted accurately in the two-gap BTK model:25 1/RN  ≈ 0.13 S, Δ s  ≈ 1.1 meV, Г s  ≈ 0.4 meV, Δ l  ≈ 4.3 meV, Г l  ≈ 1.1 meV, Z ≈ 0.1 (a); 1/RN  ≈ 0.15 S, Δ s  ≈ 1.3 meV, Δ l  ≈ 5.9 meV, Г ≈ 0.5 meV, Z ≈ 0.1 (b).

Image of FIG. 4.
FIG. 4.

A set of dI/dV(V) spectra taken at different temperatures on a one-gap contact; Δ(4.4 K) ≈ 1.5 meV, Г ≈ 0.01 meV, Z ≈ 0.1.

Image of FIG. 5.
FIG. 5.

The temperature dependence of the gap parameter Δ(T) derived from a BTK fit to the one-gap spectra of Fig. 4.

Image of FIG. 6.
FIG. 6.

The temperature behavior of the small and large gap parameters specified in the BTK analysis of one of the contacts exhibiting two-gap features: Δ s (4.1 K) ≈ 2.3 meV and Δ l (4.1 K) ≈ 4.2 meV.

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/content/aip/journal/ltp/37/4/10.1063/1.3590753
2011-06-03
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Andreev reflection spectroscopy of the new Fe-based superconductor EuAsFeO0.85F0.15: Evidence of strong anisotropy in the order parameter
http://aip.metastore.ingenta.com/content/aip/journal/ltp/37/4/10.1063/1.3590753
10.1063/1.3590753
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