Spin waves in a two dimensional p-wave superconductor: Sr$_2$RuO$_4$

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Abstract

We study spin excitations in a two dimensional p-wave superconductor with ${\vec \Delta} = {\hat d}({\hat k}_1 \pm i {\hat k}_2)$ symmetry in the context of the newly discovered superconducting Sr$_2$RuO$_4$. The polarization and spectrum of spin wave excitations are identified and their experimental consequences are discussed.

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Sr2RuO4: an electronic analogue of3He?

T. M. Rice, Ilonka M Sigrist (1995)

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Ferromagnetic spin fluctuation induced superconductivity in Sr_2RuO_4

I. Mazin, David Joseph Singh (1997)

We propose a quantitative model for triplet superconductivity in Sr_2RuO_4 based on first principles calculations for the electronic structure and magnetic susceptibility. The superconductivity is due to ferromagnetic spin fluctuations, that are strong at small wave vectors. The calculated effective mass renormalization, renormalized susceptibility, and superconducting critical temperature are all in good agreement with experiment. The most stable superconducting solution has order parameters of comparable magnitude on all three sheets of the Fermi surface. We also propose an explanation of the discrepancy between the Fermi surface topology observed in the photoemission and in de Haas-van Alphen experiments.