Superconductor and method of producing same.

摘要

A high critical temperature and high critical current density superconductor is disclosed which contains a metal oxide expressed by the following formula (I): (R<1>1-x, Bax)Ba2Cu3Od (I) wherein R<1> stands for at least one element selected from the group consisting of La, Nd, Sm, Eu and Gd, x is a number greater than 0 but not greater than 0.5 and d is a number between 6.2 and 7.2. Fine phases of RE211, RE422 and/or a metal oxide expressed by the formula (R<2>1-z, Baz)(Ba1-y, R<2>y)2Cu3Op (R<2> = La, Nd, Sm, Eu or Gd) may be dispersed in a matrix of the matrix phase of the formula (I). The above superconductor may be obtained by cooling a melt having a temperature of 1,000 DEG -1,300 DEG C and containing R<1>, Ba, Cu and O at a cooling rate of 5 DEG C/hour or less under a partial pressure of oxygen of between 0.00001 and 0.05 atm, followed by annealing at 250 DEG -600 DEG C in an oxygen atmosphere.