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Abstract:
We have measured the temperature and field dependence of the resistivity
of the unconventional superconductor Sr2RuO4 at pressures up to 3.3 GPa.
Using the Shubnikov-de Haas effect, we find that the Fermi surface sheet
believed to be primarily responsible for superconductivity becomes more
two-dimensional with increasing pressure, a surprising result that is,
however, consistent with a recent model of orbital-dependent
superconductivity in this system. Many-body enhancements and the
superconducting transition temperature all fall gradually with
increasing pressure, contrary to previous suggestions of a ferromagnetic
quantum critical point at similar to3 GPa.
