Volume 62, Number 3, May 2003
|Page(s)||412 - 418|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 April 2003|
London penetration depth measurements of the heavy-fermion superconductor near a magnetic quantum critical point
Cavendish Laboratory, University of
Cambridge Madingley Road,
Cambridge CB3 0HE, UK
2 Department of Physics and Astronomy, University of British Columbia Vancouver B.C., Canada V6T 1Z1
3 Los Alamos National Laboratory - Los Alamos, NM 87545, USA
4 Department of Earth and Ocean Sciences, University of British Columbia Vancouver B.C., Canada V6T 1Z4
Accepted: 24 February 2003
We have measured the London penetration depth of , a quantum-critical metal where superconductivity arises from a non-Fermi-liquid normal state. Using a tunnel diode oscillator with a novel coil geometry designed to avoid spurious contributions to , 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 might be due to an extension of quantum criticality into the superconducting state.
PACS: 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) / 74.70.Tx – Heavy-fermion superconductors
© EDP Sciences, 2003
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