Fishtail Hysteresis Loops Of Textured Yba2cu3o7 With High Jc

We report the studies of effects of high J(c) on fishtail hysteresis loops of highly textured YBa2Cu3O7 prepared by modified melt-textured growth (MMTG) method. It is found that: 1. The fishtail persists at least to T=20K; 2. The M(B) bumps are shifted to higher fields with decreasing temperature; 3. The bumps are shifted to higher fields for MMTG sample compared to single crystal YBa2Cu3O7; 4. Transport, J(c) does not show fishtail effect in the J(c)(B) curve.