Amorphization of Vortex Matter and Reentrant Peak Effect in YBa${}_2$Cu${}_3$O${}_{7-\delta }$

D. Pal, D. Dasgupta, B. K. Sarma +3

The peak effect (PE) has been observed in a twinned crystal of YBa${}_2$Cu${}_3$O${}_{7-\delta }$ for H$\parallel$c in the low field range, close to the zero field superconducting transition t…