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