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Unusual pressure evolution of the Meissner and Josephson effects in the heavy-fermion superconductor UPt$$_3$$

Gochi, Jun*; Sumiyama, Akihiko*; Yamaguchi, Akira*; Motoyama, Gaku*; Kimura, Noriaki*; Yamamoto, Etsuji  ; Haga, Yoshinori   ; Onuki, Yoshichika

The Josephson effect between a single crystal UPt$$_3$$ and a conventional superconductor Al has been investigated under pressure. A possible change of the superconducting order parameter has been detected at a critical $$P_c$$ where the symmetry-breaking antiferromagnetic order disappears. The conclusion is also supported by the different behaviors observed in Josephson current and penetration depth.



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Category:Materials Science, Multidisciplinary



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