Orbital dependence of the Fermi liquid state in Sr₂RuO ₄

We have used angle-resolved photoemission spectroscopy to determine the bulk electronic structure of Sr₂RuO₄ above and below the Fermi liquid crossover near 25 K. Our measurements indicate that the properties of the system are highly orbital dependent. The quasi-2D γ band displays Fermi liquid behavior while the remaining low energy bands show exotic properties consistent with quasi-1D behavior. In the Fermi liquid state below 25 K, the γ band dominates the electronic properties, while at higher temperatures the quasi-1D β and α bands become more important.