| Issue |
Europhys. Lett.
Volume 51, Number 3, August I 2000
|
|
|---|---|---|
| Page(s) | 341 - 347 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00358-9 | |
| Published online | 01 September 2002 | |
Experimental observation of the selection rule in Josephson coupling
between 
and 
1
Department of Physics, The Pennsylvania State
University University Park, PA 16802, USA
2
Department of Physics, Kyoto University - Kyoto 606-8502, Japan
and CREST, Japan Science and Technology Corporation Kawaguchi,
Saitama 332-0012, Japan
Received:
28
February
2000
Accepted:
24
May
2000
We have carried out experimental studies on the Josephson coupling between
a conventional
s-wave superconductor (In) and
and found that the coupling
is allowed in the in-plane direction, but not along the
c-axis. This selection rule indicates that
the symmetry of superconducting order parameter of
is either
p- or, alternatively, purely d-wave.
If is a
p-wave superconductor, as strongly favored by other experimental
evidence, our result suggests that the pairing state of
is
, with
,
a nodeless state in
which the spins of the superconducting electrons lie in the
planes.
PACS: 74.50.+r – Proximity effects, weak links,
tunneling phenomena, and
Josephson effects / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.70.-b – Superconducting materials(excluding high-
compounds)
© EDP Sciences, 2000
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