 can be described by composition formula: Cu0xe0x00x00xMx(Ba0xe0x00x00y,Sry)0(Ca0xe0x00x00zLz)nxe0x00x000CunO0n+0xe0x00x00w where M represents ions of one or more polyvalent metallic elements selected from the class which consists of Tl, Bi, Pb, In, Ga, Sn, Ti, V, Cr, Mn, Fe, Co, Ni, Zr, Nb, Mo, W, Re and Os; L represents one or more elements selected from the class which consists of Mg and alkaline metallic elements; 0xe0x00xa0xxe0x00xa00.0; 0xe0x00xa0yxe0x00xa00; 0xe0x00xa0zxe0x00xa00; 0xe0x00xa0wxe0x00xa00; and 0xe0x00xa0nxe0x00xa000. The present invention also provides selective reduction type, high temperature superconductor, characterized in that it is made of a (Cu, Tl) group, high temperature superconducting material that can be described by composition formula: Cu0xe0x00x00xTlx(Ba0xe0x00x00ySry)0(Ca0xe0x00x00zLz)nxe0x00x000CunO0n+0xe0x00x00w where L represents one or more elements selected from the class which consists of Mg and alkaline metallic elements; 0xe0x00xa0xxe0x00xa00.0; 0xe0x00xa0yxe0x00xa00; 0xe0x00xa0zxe0x00xa00; 0xe0x00xa0wxe0x00xa00; and 0xe0x00xa0nxe0x00xa000. The present invention also provides a selective reduction type, high temperature superconductor, characterized in that it is made of a (Cu, Tl) group, high temperature superconducting material that can be described by composition formula: Cu0xe0x00x00xTlx(Ba0xe0x00x00ySry)0(Ca0xe0x00x00zLz)0Cu0O00xe0x00x00w where L represents one or more elements selected from the class which consists of Mg and alkaline metallic elements; 0xe0x00xa0xxe0x00xa00.0; 0xe0x00xa0yxe0x00xa00; 0xe0x00xa0zxe0x00xa00; and 0xe0x00xa0wxe0x00xa00. The present invention also provides a selective reduction type, high temperature superconductor, characterized in that it is made of a high temperature superconducting material that can be described by composition formula: Cu0xe0x00x00xTlx(Ba0xe0x00x00ySry)0(Ca0xe0x00x00zLz)0Cu0O00xe0x00x00w where L represents one or more elements selected from the class which consists of Mg and alkaline metallic elements; 0xe0x00xa0xxe0x00xa00.0; 0xe0x00xa0yxe0x00xa00; 0xe0x00xa0zxe0x00xa00; and 0xe0x00xa0wxe0x00xa00. The present invention further provides a selective reduction type, high temperature superconductor, characterized in that 