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We study the dynamical spin susceptibility $\chi ({\bf q},\omega)$ forspin-triplet superconductivity. We show that a large peak at $\omega = 2\Delta$ appears in $\textrm{Im} \chi_{zz}({\mathbf{Q}}, \omega)$, where $z$ isthe direction of the $\mathbf{d}$ vector for triplet pairing, if Fermi surfacehas a nested part with the nesting vector $\mathbf{Q}$ and the order parameteris $+\Delta$ and $-\Delta$ in this part of the Fermi surface. If there are linenodes in the nested part of the Fermi surface, a peak appears in either$\textrm{Im} \chi_{zz}(\mathbf{Q}, \omega)$ or  $\textrm{Im} \chi_{+-}(\mathbf{Q}, \omega)$, or both, depending on theperpendicular component of the nesting vector. The comparison with inelasticneutron scattering experiments can determine the position of the line nodes intriplet superconductor Sr$_2$RuO$_4$.Comment: 7 pages, 9 figure

physical review. b, condensed matter

Coherence peak in the spin susceptibility from nesting in spin-triplet superconductors: A probe for line nodes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">RuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Coherence peak in the spin susceptibility from nesting in spin-triplet superconductors: A probe for line nodes inSr2RuO4