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Abstract:
High-resolution angular resolved photoemission data reveal well-defined
quasiparticle bands of unusually low weight, emerging in line with the
metallic phase of Ca3Ru2O7 below similar to 30 K. At the bulk structural
phase transition temperature of 48 K, we find clear evidence for an
electronic instability, gapping large parts of the underlying Fermi
surface that appears to be nested. Metallic pockets are found to survive
in the small, non-nested sections, constituting a low-temperature Fermi
surface with 2 orders of magnitude smaller volume than in all other
metallic ruthenates. The Fermi velocities and volumes of these pockets
are in agreement with the results of complementary quantum oscillation
measurements on the same crystal batches.
