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