Hamburg 2001 – scientific programme
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TT: Tiefe Temperaturen
TT 9: Tunneln und Ordnungsparameter
TT 9.3: Talk
Tuesday, March 27, 2001, 10:00–10:15, H
Point-contact spectroscopy studies on superconducting Sr2RuO4: experiment and theory — •F. Laube1, G. Goll1, H. v. Löhneysen1,2, M. Fogelström3, F. Lichtenberg4, Z. Q. Mao5, and Y. Maeno5 — 1Physikalisches Institut, Universität Karlsruhe — 2Institut für Festkörperphysik, Forschungszentrum Karlsruhe — 3Institute of Theoretical Physics, Chalmers University of Technology and Göteborg University, Sweden — 4Experimentalphysik VI, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg — 5Department of Physics, Kyoto University, Japan
Sr2RuO4, being isostructural to the high Tc superconductor (La,Sr)2CuO4, exhibits an unconventional superconducting ground state (Tc=1.5 K). We present conductance measurements of normal conductor/superconductor point-contacts between Pt and Sr2RuO4 in zero and applied magnetic field in order to get information about the symmetry of the superconducting order parameter. In the superconducting state an Andreev bound state is formed at the superconductor surface, which is observed as a zero-bias anomaly in the spectra, i.e. dI/dV vs. V [1]. We compare measurements on different single-crystals with theoretical predictions within a self-consistent quasiclassical approach - possible up to the thermodynamic critical field - and conclude that a spin-triplet state is most favourable.
[1] F. Laube et al., Phys. Rev. Lett. 84 (2000) 1595.