Spin-triplet superconductivity in Sr${}_2$RuO${}_4$ probed by Andreev reflection

Abstract

The superconducting gap function of Sr${}_2$RuO${}_4$ was investigated by means of quasiparticle reflection and transmission at the normal conductor-superconductor interface of Sr${}_2$RuO${}_4$-Pt point contacts. We found two distinguishly 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 Sr${}_2$RuO${}_4$.

4 pages, 4 figures, published version

References in corpus (1)

• Evidence for incommensurate spin fluctuations in Sr_2RuO_4

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