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Zusammenfassung:
The oxide superconductor Sr2RuO4 is emerging as an archetypal strongly
correlated electron system. We review the experimental situation,
focusing on Fermi surface specific probes. Quantum oscillation
measurements have revealed a Fermi surface consisting of three slightly
warped cylinders populated by quasiparticles with masses ranging from
3.4 to 14.6 times the bare electron mass. Then is strong evidence that
Sr2RuO4 is a spin-triplet superconductor, and the simplicity of the
Fermi surface combined with detailed knowlege of the quasiparticle
properties from quantum oscillation and orbital specific NMR
measurements means that Sr2RuO4 may be a key system for understanding
unconventional superconductivity. We compare Sr2RuO4 With
three-dimensional nearly ferromagnetic 3d-metals, and suggest that
quasi-tno-dimensional spin-fluctuations may be responsible for the fact
that Sr2RuO4 is the first nearly ferromagnetic metal to show
superconductivity. (C) 1999 Elsevier Science B.V. All rights reserved.
