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Zusammenfassung:
Sr 2RuO 4 was recently discovered to be the first layered perovskite
superconductor (T c=1 K) containing no copper. Its normal state
properties are also of interest, because it is strongly two-dimensional,
like the high Tc cuprates, but differs from them in the type and
concentration of carriers. It thus provides us with a new opportunity to
shed light on the relative roles of reduced dimensionality versus other
aspects of the electronic structure in producing anomalous normal state
properties in layered metallic oxides. Here we report the observation of
quantum oscillations in the resistivity and magnetisation of Sr 2RuO 4.
Our findings are consistent with the existence of three partially filled
energy bands giving almost cylindrical Fermi surfaces, the areas of
which are in fairly good agreement with the predictions of electronic
energy band structure calculations. However the cyclotron masses are
considerably enhanced, showing the importance of correlations. In spite
of the low dimensionality of Sr 2RuO 4, our observations are consistent
with the predictions of the standard Fermi liquid theory of correlated
electron systems.
