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Abstract:
The concept of quantum criticality is proving to be central to attempts
to understand the physics of strongly correlated electrons. Here, we
argue that observations on the itinerant metamagnet Sr3Ru2O7 represent
good evidence for a new class of quantum critical point, arising when
the critical end point terminating a tine of first-order transitions is
depressed toward zero temperature. This is of interest both in its own
right and because of the convenience of having a quantum critical point
for which the tuning parameter is the magnetic field. The relationship
between the resultant critical fluctuations and novel behavior very near
the critical field is discussed.
