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

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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Category:Physics, Multidisciplinary

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