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Metamagnetic Quantum Criticality in Sr3Ru2O7

By Andrew J (Professor) Schofield, A. J. Millis, S. A. Grigera and G. G. Lonzarich

Abstract

We consider the metamagnetic transition in the bilayer ruthenate, ${\rm Sr_3Ru_2O_7}$, and use this to motivate a renormalization group treatment of a zero-temperature quantum-critical end-point. We summarize the results of mean field theory and give a pedagogical derivation of the renormalization-group equations. These are then solved to yield numerical results for the susceptibility, the specific heat and the resistivity exponent which can be compared with measured data on ${\rm Sr_3Ru_2O_7}$ to provide a powerful test for the standard framework of metallic quantum criticality. The observed approach to the critical point is well-described by our theory explaining a number of unusual features of experimental data. The puzzling behaviour very near to the critical point itself, though, is not accounted for by this, or any other theory with a Fermi surface

Topics: QC Physics
Year: 2002
DOI identifier: 10.1007/3-540-45814-X_18
OAI identifier: oai:eprints.bham.ac.uk:255

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