CeCoIn5 - a quantum critical superfluid
  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. 
S. Ozcan, D. M. Broun, B. Morgan, R. K. W. Haselwimmer, J. R. Waldram,   J. L. Sarrao, Saeid Kamal, C. P. Bidinosti and P. J...