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arXiv · 1904.01234

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

Kazuki Iida·Maiko Kofu·Katsuhiro Suzuki·Naoki Murai·Seiko Ohira-Kawamura·Ryoichi Kajimoto·Yasuhiro Inamura·Motoyuki Ishikado·Shunsuke Hasegawa·Takatsugu Masuda·Yoshiyuki Yoshida·Kazuhisa Kakurai·Kazushige Machida·Seunghun Lee
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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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Kazuki Iida, Maiko Kofu, Katsuhiro Suzuki, Naoki Murai, Seiko Ohira-Kawamura, Ryoichi Kajimoto, Yasuhiro Inamura, Motoyuki Ishikado, Shunsuke Hasegawa, Takatsugu Masuda, Yoshiyuki Yoshida, Kazuhisa Kakurai, Kazushige Machida, Seunghun Lee. 2019-04-02. Spin gap and L modulated intensity at the low-energy incommensurate magnetic fluctuations in the superconducting state of Sr2RuO4. https://doi.org/10.7566/jpsj.89.053702

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