| Issue |
Europhys. Lett.
Volume 33, Number 7, March I 1996
|
|
|---|---|---|
| Page(s) | 557 - 562 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00378-5 | |
| Published online | 01 September 2002 | |
Anisotropy of the superconducting energy gap in URuuSi2 studied by point-contact spectroscopy
1
Physikalisches Institut Universität Karlsruhe - 76128 Karlsruhe, Germany
2
Institute for Low Temperature Physics and Engineering, Academy of Science of
Ukraine, 310164 Kharkov, Ukraine
3
Van der Waals-Zeeman Laboratorium, Universiteit van Amsterdam,
1018 XE
Amsterdam, The Netherlands
Received:
27
November
1995
Accepted:
19
January
1996
The differential resistance 
vs. applied voltage V for 
–normal-metal point-contacts
(PCs) is investigated. For some PCs a clear double-minimum structure is
observed in
vs. V at zero bias well below the
superconducting critical temperature Tc as expected for the
Andreev reflection. The double minimum occurs only for PCs with
suppressed antiferromagnetic (AF) features in , in
support of a recent model of the gap depression by AF order in the
(a,b)-plane of tetragonal . A strong anisotropy of the
reduced gap 2
and of 
for PCs along the a and the c axis is also observed.
PACS: 74.70.Tx – Heavy-fermion superconductors / 73.40.Jn – Metal-to-metal contacts / 74.70.-b – Superconducting materials (excluding high-Tc cuprates)
© EDP Sciences, 1996
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