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Superfluid density in gapless superconductor CeCoIn(5).

V G Kogan¹, R Prozorov, C Petrovic

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

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|August 6, 2011

Summary

Superconductivity in CeCoIn(5) is gapless due to strong pair-breaking scattering. This leads to a temperature dependence of the London penetration depth that agrees with theoretical models for gapless d-wave superconductors.

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Area of Science:

Condensed Matter Physics
Materials Science
Superconductivity

Background:

CeCoIn(5) exhibits complex superconducting properties.
Understanding the nature of its superconducting gap is crucial.

Purpose of the Study:

To investigate the temperature dependence of London penetration depth in CeCoIn(5).
To determine the nature of the superconducting gap (gapless or gapped).
To analyze the role of scattering mechanisms in CeCoIn(5) superconductivity.

Main Methods:

Measurement of London penetration depth (λ) in single crystals of CeCoIn(5) across a temperature range.
Theoretical modeling of the London penetration depth for gapless superconductors.

Main Results:

The temperature dependence of λ in CeCoIn(5) is consistent with a gapless d-wave superconductor.
A derived formula λ = λ(0)(1-T(2)/T(c)(2))(-1/2) accurately describes the experimental data.
The model accounts for both magnetic and non-magnetic scattering effects.
The calculated slope of the upper critical field at T(c) aligns with experimental observations.

Conclusions:

Superconductivity in CeCoIn(5) is confirmed to be gapless.
Strong pair-breaking scattering is the primary cause of the gapless nature.
The findings support theoretical predictions for gapless d-wave superconductivity.