Metamagnetic Quantum Criticality in Sr3Ru2O7

Andrew Schofield, AJ Millis, GG Lonzarich, Santiago Grigera, C Noce (Ed), A Vecchione (Ed), M Cuoco (Ed), A Romano (Ed)

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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.
Original languageEnglish
Title of host publicationRuthenate and Rutheno-Cuprate Materials
Subtitle of host publicationUnconventional Superconductivity, Magnetism and Quantum Phase Transitions
Place of PublicationBerlin
PublisherSpringer
Pages271-289
Volume603
ISBN (Print)3-540-44275-8
DOIs
Publication statusPublished - 1 Jan 2002

Publication series

NameLecture Notes in Physics
PublisherSpringer
Volume603
ISSN (Print)0075-8450

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