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Twofold spontaneous symmetry breaking in the heavy-fermion superconductor UPt$$_3$$

Machida, Yo*; Ito, Atsushi*; So, Yoshinao*; Izawa, Koichi*; Haga, Yoshinori  ; Yamamoto, Etsuji  ; Kimura, Noriaki*; Onuki, Yoshichika; Tsutsumi, Yasumasa*; Machida, Kazushige*

The field-orientation dependent thermal conductivity of the heavy-fermion superconductor UPt$$_3$$ was measured down to very low temperatures and under magnetic fields throughout the distinct superconducting phases: $$B$$ and $$C$$ phases. In the $$C$$ phase, a striking twofold oscillation of the thermal conductivity within the basal plane is resolved reflecting the superconducting gap structure with a line of node along the $$a$$ axis. From this result together with the symmetry consideration, the gap function of UPt$$_3$$ is determined as a $$E_{1u}$$ representation characterized by a combination of two line nodes at the tropics and point nodes at the poles.



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Category:Physics, Multidisciplinary



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