Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion.
We report low-temperature thermal expansion measurements on the bilayer ruthenate Sr3Ru2O7 as a function of magnetic field applied perpendicular to the ruthenium-oxide planes. The field dependence of the c-axis expansion coefficient indicates the accumulation of entropy close to 8 T, related to an underlying quantum critical point. The latter is masked by two first-order metamagnetic transitions which bound a regime of enhanced entropy. Outside this region the singular thermal expansion behavior is compatible with the predictions of the itinerant theory for a two-dimensional metamagnetic quantum critical end point.
Gegenwart
P
P
Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
Weickert
F
F
Garst
M
M
Perry
R S
RS
Maeno
Y
Y