Incommensurate magnetic ordering in Sr_2Ru_(1-x)Ti_xO_4

Details Incommensurate magnetic ordering in Sr_2Ru_(1-x)Ti_xO_4 Incommensurate magnetic ordering in Sr_2Ru_(1-x)Ti_xO_4

2001-07-27

arxiv.org/abs/cond-mat/0107579v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages 3 figures revtex-version corrected

Scientific paper

10.1103/PhysRevLett.88.197002

In $\rm Sr_2RuO_4$ 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 $\rm Sr_2RuO_4$ 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.

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