Studies of high-T-c YBa(2)Cu(3)O(y)SQUIDs

The characteristics of high-T-c step-edge or bicrystal junctions and SQUIDs are examined. The IcRn product of junctions was found to be proportional t o (j(c))(p) with p similar to 0.5 over several orders of magnitude in j(c) and at various temperatures. The V - Phi and noise characteristics of SQUID were compared with the numerical expression of Enpuku et al. We demonstrat e that 1/f noise can be induced with an applied external magnetic field. Th e microwave radiation reduces the modulation depth, V-pp, distorts the V - Phi curve, and decreases the field sensitivity of SQUID magnetometers.