| Issue |
Europhys. Lett.
Volume 62, Number 3, May 2003
|
|
|---|---|---|
| Page(s) | 412 - 418 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00411-9 | |
| Published online | 01 April 2003 | |
London penetration depth measurements of the heavy-fermion
superconductor 
near a magnetic quantum critical
point
1
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
Received:
8
August
2002
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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