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Report No.

Evidence for spin singlet pairing with strong uniaxial anisotropy in URu$$_2$$Si$$_2$$ using nuclear magnetic resonance

Hattori, Taisuke; Sakai, Hironori   ; Tokunaga, Yo  ; Kambe, Shinsaku  ; Matsuda, Tatsuma*; Haga, Yoshinori   

In order to identify the spin contribution to superconducting pairing compatible with the so-called "hidden order", $$^{29}$$Si nuclear magnetic resonance measurements have been performed using a high-quality single crystal of URu$$_2$$Si$$_2$$. A clear reduction of the $$^{29}$$Si Knight shift in the superconducting state has been observed under magnetic field applied along the crystalline $$c$$ axis, corresponding to the magnetic easy axis. These results provide direct evidence for the formation of spin-singlet Cooper pairs. Consequently, results indicating a very tiny change of in-plane Knight shift reported previously demonstrate extreme uniaxial anisotropy for the spin susceptibility in the hidden order state.



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Category:Physics, Multidisciplinary



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