Abstract
The Josephson critical current I c between a single-crystal UPt 3 and Al has been measured for the junctions on the UPt 3 surface perpendicular to the hexagonal a [11\bar20], b [10\bar10], 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 2 u scenario for the odd-parity order parameter in UPt 3 , in which the Josephson effect is forbidden in the three directions, whereas the recently proposed E 1 u scenario permits, at least, the a - and c -axis Josephson couplings.
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