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CeCoIn5 - a quantum critical superfluid

S. Ozcan·D. M. Broun·B. Morgan·R. K. W. Haselwimmer·J. R. Waldram·J. L. Sarrao·Saeid Kamal·C. P. Bidinosti·P. J. Turner
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Abstract

We have made the first complete measurements of the London penetration depth $λ(T)$ of CeCoIn5, a quantum-critical metal where superconductivity arises from a non-Fermi-liquid normal state. Using a novel tunnel diode oscillator designed to avoid spurious contributions to $λ(T)$, we have established the existence of intrinsic and anomalous power-law behaviour at low temperature. A systematic analysis raises the possibility that the unusual observations are due to an extension of quantum criticality into the superconducting state.

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S. Ozcan, D. M. Broun, B. Morgan, R. K. W. Haselwimmer, J. R. Waldram, J. L. Sarrao, Saeid Kamal, C. P. Bidinosti, P. J. Turner. 2002-06-06. CeCoIn5 - a quantum critical superfluid. https://doi.org/10.1209/epl%2Fi2003-00411-9

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