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