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Abstract:
The bilayer ruthenate Sr3Ru2O7 has been cited as a textbook example of
itinerant metamagnetic quantum criticality. However, recent studies of
the ultrapure system have revealed striking anomalies in magnetism and
transport in the vicinity of the quantum critical point. Drawing on
fresh experimental data, we show that the complex phase behavior
reported here can be fully accommodated within the framework of a simple
Landau theory. We discuss the potential physical mechanisms that
underpin the phenomenology, and assess the capacity of the ruthenate
system to realize quantum tricritial behavior.
