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Incommensurate magnetic ordering in Sr₂Ru_(1-x)Ti_xO₄

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arxiv cond-mat/0107579 v2 pith:7Z4LKVBP submitted 2001-07-27 cond-mat.str-el cond-mat.supr-con

Incommensurate magnetic ordering in Sr₂Ru_(1-x)Ti_xO₄

M. Braden , O. Friedt , Y. Sidis , P. Bourges , M. Minakata , Y. Maeno This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords incommensuratespinfluctuationsmagneticadditionalonganisotropyarise
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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