The superconductivity of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Sr</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">RuO</mi></mrow><mrow><mn>4</mn></mrow></msub></mrow></math></span> and the physics of spin-triplet pairing

Andrew Peter Mackenzie; Yoshiteru Maeno

doi:10.1103/RevModPhys.75.657

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The superconductivity of ${Sr}_{2} {RuO}_{4}$ and the physics of spin-triplet pairing

Andrew Peter Mackenzie and Yoshiteru Maeno

Andrew Peter Mackenzie

School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, Scotland

Yoshiteru Maeno

Department of Physics, Kyoto University, Kyoto 606-8502, Japan
International Innovation Center, Kyoto University, Kyoto 606-8501, Japan

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Rev. Mod. Phys. 75, 657 – Published 1 May, 2003

DOI: https://doi.org/10.1103/RevModPhys.75.657

Abstract

This review presents a summary and evaluation of the experimental properties of unconventional superconductivity in ${Sr}_{2} {RuO}_{4}$ as they were known in the spring of 2002. At the same time, the paper is intended to be useful as an introduction to the physics of spin-triplet superconductivity. First, the authors show how the normal-state properties of ${Sr}_{2} {RuO}_{4}$ are quantitatively described in terms of a quasi-two-dimensional Fermi liquid. Then they summarize its phenomenological superconducting parameters in the framework of the Ginzburg-Landau model, and discuss the existing evidence for spin-triplet pairing. After a brief introduction to the vector order parameter, they examine the most likely symmetry of the triplet state. The structure of the superconducting energy gap is discussed, as is the effect of symmetry-breaking magnetic fields on the phase diagram. The article concludes with a discussion of some outstanding issues and desirable future work. Appendixes on additional details of the normal state, difficulty in observing the bulk Fermi surface by angle-resolved photoemission, and the enhancement of superconducting transition temperature in a two-phase ${Sr}_{2} {RuO}_{4} - Ru$ system are included.

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The superconductivity of ${Sr}_{2} {RuO}_{4}$ and the physics of spin-triplet pairing

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The superconductivity of Sr2RuO4 and the physics of spin-triplet pairing

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The superconductivity of ${Sr}_{2} {RuO}_{4}$ and the physics of spin-triplet pairing