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Spin gap and L modulated intensity at the low-energy incommensurate magnetic fluctuations in the superconducting state of Sr2RuO4

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arxiv 1904.01234 v2 pith:MTFKO7DS submitted 2019-04-02 cond-mat.supr-con

Kazuki Iida , Maiko Kofu , Katsuhiro Suzuki , Naoki Murai , Seiko Ohira-Kawamura , Ryoichi Kajimoto , Yasuhiro Inamura , Motoyuki Ishikado
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Shunsuke Hasegawa Takatsugu Masuda Yoshiyuki Yoshida Kazuhisa Kakurai Kazushige Machida Seunghun Lee
This is my paper · ORCID
classification cond-mat.supr-con
keywords fluctuationslow-energymagneticalphabetacalculationsincommensurateintensity
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abstract

Low-energy incommensurate (IC) magnetic fluctuations in the multiband superconductor Sr$_2$RuO$_4$ is investigated by high-resolution inelastic neutron scattering measurements and random phase approximation (RPA) calculations. Below $T_\text{c}$, the substantial spin gap is observed at $\mathbf{Q}_\text{IC}=(0.3, 0.3, L)$ where the quasi-one-dimensional $\alpha$ and $\beta$ sheets consisting of the Fermi surfaces are in good nesting conditions. $L$ modulated intensity of the low-energy IC magnetic fluctuations and our RPA calculations indicate that the superconducting gaps regarding the $\alpha$ and $\beta$ sheets have the horizontal line nodes.

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