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# Metamagnetic Quantum Criticality in Sr3Ru2O7

Schofield, Andrew J (Professor) and Millis, A. J. and Grigera, S. A. and Lonzarich, G. G. (2002) Metamagnetic Quantum Criticality in Sr3Ru2O7. Lecture Notes in Physics, 603. pp. 271-289. ISSN 1616-6361

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URL of Published Version: http://dx.doi.org/10.1007/3-540-45814-X_18

Identification Number/DOI: doi:10.1007/3-540-45814-X_18

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.

Type of Work: Article 2002 (Publication) Schools (1998 to 2008) > School of Physics & Astronomy School of Physics and Astronomy QC Physics University of Birmingham, Columbia University, University of St Andrews, University of Cambridge A. J. Schofield 255 YES

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