Incommensurate magnetic ordering in Sr_2Ru_(1-x)Ti_xO_4

Abstract

In $\mathrm{S}{\mathrm{r}}_2\mathrm{Ru}{\mathrm{O}}_4$ the spin excitation spectrum is dominated by incommensurate fluctuations at q=(0.3 0.3 q${}_z$), which arise from Fermi-surface nesting. We show that upon Ti substitution, known to suppress superconductivity, a short range magnetic order develops with a propagation vector (0.307 0.307 1). This finding confirms that superconducting $\mathrm{S}{\mathrm{r}}_2\mathrm{Ru}{\mathrm{O}}_4$ is extremely close to an incommensurate spin density wave instability. In addition, the ordered moment in \srton ~ points along the c-direction, which indicates that the incommensurate spin fluctuations exhibit the anisotropy required to explain a p-wave spin triplet pairing.

4 pages 3 figures revtex-version corrected

References in corpus (2)

• Interband proximity effect and nodes of superconducting gap in Sr2RuO4
• Magnetic ordering in Sr2RuO4 induced by nonmagnetic impurities

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