| Numéro |
J. Phys. IV France
Volume 114, April 2004
|
|
|---|---|---|
| Page(s) | 245 - 249 | |
| DOI | https://doi.org/10.1051/jp4:2004114052 | |
J. Phys. IV France 114 (2004) 245
DOI: 10.1051/jp4:2004114052
The superconducting order parameter in the organic layered
superconductor
-(BEDT-TTF)
2Cu[ N(CN)
2] Br
M. Pinteric1, 2, S. Tomic1 and K. Maki3
1 Institut za fiziku, Zagreb, Croatia
2 Faculty of Civil Engineering, University of Maribor, Slovenia
3 Department of Physics and Astronomy, USC, Los Angeles, USA
Abstract
Highly sensitive ac susceptibility measurements were
performed in order to resolve the controversy regarding the symmetry of the
superconducting order parameter in
-BEDT-TTF materials. The
experimentally obtained superfluid density behaviour qualitatively
contradicts
s-wave symmetry theoretical predictions, but disagrees also
quantitatively with the
d-wave expected behaviour in the weak coupling limit.
The mixture of
d-wave and
s-wave parameters, with a rather large proportion of
the latter, describes well the results; however, it also opens new questions
regarding the origin of the superconducting pairing.
Key words. organic superconductivity, ac susceptibility, magnetic
penetration depth.
© EDP Sciences 2004