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Evidence for weak spin-orbit interaction experienced by Cooper pairs in the spin-triplet superconductor UPt$$_3$$; $$^{195}$$Pt-NMR study

Aoyama, Taisuke*; Kotegawa, Hisashi*; Kimura, Noriaki*; Yamamoto, Etsuji ; Haga, Yoshinori ; Onuki, Yoshichika*; To, Hideki*

$$^{195}$$Pt-NMR measurements under magnetic field ($$H$$) parallel to the $$c$$-axis in the vicinity of the upper critical field $$H_{rm c2}$$ have been carried out on the heavy-fermion superconductor UPt$$_3$$. The quasiparticle spin susceptibility was obtained from the measurements. The field dependence of the susceptibility suggests that the $$d$$-vector freely rotates in magnetic field. It is therefore concluded that spin-orbit interaction, which confines the direction of the $$d$$-vector with respect to the crystal axis, is weak in UPt$$_3$$.



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Category:Physics, Multidisciplinary



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