CeCoIn5 - a quantum critical superfluid

Details CeCoIn5 - a quantum critical superfluid CeCoIn5 - a quantum critical superfluid

2002-06-06

arxiv.org/abs/cond-mat/0206069v1

EUROPHYS LETT 62 (3): 412-418 MAY 2003

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1209/epl/i2003-00411-9

We have made the first complete measurements of the London penetration depth $\lambda(T)$ 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 $\lambda(T)$, 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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