Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion

Details Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion

2005-07-15

arxiv.org/abs/cond-mat/0507359v3

Phys. Rev. Lett. 96, 136402 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.96.136402

We report low-temperature thermal expansion measurements on the bilayer ruthenate Sr$_3$Ru$_2$O$_7$ 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 Tesla, 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.

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