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Horizontal line nodes in Sr$$_2$$RuO$$_4$$ proved by spin resonance

スピンレゾナンスにより実証されたSr$$_2$$RuO$$_4$$の水平ラインノード

飯田 一樹*; 古府 麻衣子  ; 鈴木 雄大*; 村井 直樹; 河村 聖子; 梶本 亮一  ; 稲村 泰弘; 石角 元志*; 長谷川 舜介*; 増田 隆嗣*; 吉田 良行*; 加倉井 和久*; 町田 一成*; Lee, S.*

Iida, Kazuki*; Kofu, Maiko; Suzuki, Katsuhiro*; Murai, Naoki; Kawamura, Seiko; Kajimoto, Ryoichi; Inamura, Yasuhiro; Ishikado, Motoyuki*; Hasegawa, Shunsuke*; Masuda, Takatsugu*; Yoshida, Yoshiyuki*; Kakurai, Kazuhisa*; Machida, Kazushige*; Lee, S.*

We investigated the low-energy incommensurate (IC) magnetic fluctuations in Sr$$_2$$RuO$$_4$$ by the high-resolution inelastic neutron scattering measurements and random phase approximation (RPA) calculations. We observed a spin resonance with energy of $$hbar omega_{rm res}0.56$$ meV centered at a characteristic wavevector $$Q_{rm res}=(0.3,0.3,0.5)$$. The resonance energy corresponds well to the superconducting gap 2$$Delta$$ = 0.56 meV estimated by the tunneling spectroscopy. The spin resonance shows the $$L$$ modulation with a maximum at around $$L = 0.5$$. The $$L$$ modulated intensity of the spin resonance and our RPA calculations indicate that the superconducting gaps regarding the quasi-one-dimensional $$alpha$$ and $$beta$$ sheets at the Fermi surfaces have the horizontal line nodes. These results may set a strong constraint on the pairing symmetry of Sr$$_2$$RuO$$_4$$. We also discuss the implications on possible superconducting order parameters.

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パーセンタイル:100

分野:Physics, Multidisciplinary

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