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

重い電子系超伝導体UPtにおける、マイスナー効果及びジョセフソン効果の異常な圧力効果

郷地 順*; 住山 昭彦*; 山口 明*; 本山 岳*; 木村 憲彰*; 山本 悦嗣  ; 芳賀 芳範   ; 大貫 惇睦

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

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