Measurement of the Josephson Effect of Heavy-Fermion Superconductor UPt3 as a Test of the Odd-Parity Order Parameter

作者：Gouchi Jun^*; Sumiyama Akihiko; Motoyama Gaku; Yamaguchi Akira; Kimura Noriaki; Yamamoto Etsuji; Haga Yoshinori; Onuki Yoshichika

来源：Journal of the Physical Society of Japan, 2012, 81(11): 113701.

DOI：10.1143/JPSJ.81.113701

• Josephson effect
• heavy-fermion superconductor
• UPt3

The Josephson critical current I-c between a single-crystal UPt3 and Al has been measured for the junctions on the UPt3 surface perpendicular to the hexagonal a[11 (2) over bar0], b[10 (1) over bar0], and c[0001] axes. The magnetic field dependence of I-c shows a Fraunhofer diffraction pattern for a current flow parallel to the c-axis, suggesting that the Josephson coupling is uniform throughout the junction. Small modifications applied to the Fraunhofer pattern have been observed for a current flow parallel to the a- and b-axes. These results contradict the E-2u scenario for the odd-parity order parameter in UPt3, in which the Josephson effect is forbidden in the three directions, whereas the recently proposed E-1u scenario permits, at least, the a- and c-axis Josephson couplings.

• 出版日期2012-11