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A BCS-like gap in the superconductor SmFeAsO0.85F0.15.

T Y Chen¹, Z Tesanovic, R H Liu

¹Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

|June 6, 2008

Summary

Researchers observed a single superconducting gap in SmFeAsO(0.85)F(0.15) using Andreev spectroscopy. This finding, consistent with Bardeen-Cooper-Schrieffer (BCS) theory, differs from high-temperature copper oxide superconductors.

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Area of Science:

Condensed Matter Physics
Materials Science
Superconductivity

Background:

High-transition-temperature (high-T(c)) superconductivity in copper oxides relies on CuO(2) planes.
A new class of oxypnictide superconductors, LaFeAsO(1-x)F(x), lacks CuO(2) planes, suggesting alternative pairing mechanisms.
The superconducting gap's properties are crucial for understanding pairing mechanisms.

Purpose of the Study:

To investigate the superconducting gap in the oxypnictide superconductor SmFeAsO(0.85)F(0.15).
To compare the observed gap behavior with Bardeen-Cooper-Schrieffer (BCS) theory and copper oxide superconductors.
To determine the gap order parameter's nature (nodal/nodeless, isotropic/anisotropic).

Main Methods:

Andreev spectroscopy was employed to measure the superconducting gap.
The temperature dependence of the gap was studied.
The ratio 2Delta/k(B)T(c) was calculated and compared to theoretical predictions.

Main Results:

A single superconducting gap was observed in SmFeAsO(0.85)F(0.15) with T(c) = 42 K.
The gap value is 2Delta = 13.34 +/- 0.3 meV, yielding 2Delta/k(B)T(c) = 3.68, close to the BCS prediction (3.53).
The gap exhibits BCS-consistent temperature dependence and is nodeless and nearly isotropic, unlike the pseudogap in copper oxides.

Conclusions:

The results suggest a pairing mechanism in SmFeAsO(0.85)F(0.15) that differs from those in copper oxide superconductors.
The observed nodeless and nearly isotropic gap is incompatible with models based on antiferromagnetic fluctuations or strong correlations relevant to high-T(c) cuprates.
This study provides critical insights into the fundamental nature of superconductivity in iron-based oxypnictides.