A high critical temperature and high critical current density superconductor is disclosed which contains {HEAD ~ a metal oxide} expressed by {TAIL ~ the following formula} : 
A high critical temperature and high critical current density superconductor is disclosed which contains { HEAD ~ a metal oxide } expressed by { TAIL ~ the following formula } :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH