Spin-triplet superconductivity in Sr2RuO4 probed by andreev reflection
The superconducting gap function of Sr2RuO4 was investigated by means of quasiparticle reflection and transmission at the normal conductor-superconductor interface of Sr2RuO4-Pt point contacts. We found two distinctly different types of dV/dI vs V spectra either with a double-minimum structure or with a zero-bias conductance anomaly. Both types of spectra are expected in the limit of high and low transparency, respectively, of the interface barrier between a normal metal and a spin-triplet superconductor. Together with the temperature dependence of the spectra this result strongly supports a spin-triplet superconducting order parameter for Sr2RuO4.
Laube
F
Physikalisches Institut, Universitat Karlsruhe, D-76128 Karlsruhe, Germany.
Goll
G
Lohneysen
H
Fogelstrom
M
Lichtenberg
F