  A new DC-SQUID is proposed that exploits the properties of the grain boundary
junctions in high T_c superconductors. The orientations of the grain boundaries
are chosen in such a way to establish a pi/2 (rather than 0 or pi) phase
difference between the equilibrium phases of the two Josephson junctions in the
SQUID loop. This property is exploited to increase the sensitivity and
direction dependence of the SQUID for measuring magnetic flux without
additional flux generating coils.
