High temperature superconductors
A high temperature superconductor composition includes a matrix of a high temperature superconductive oxide. Non-superconductive particles are distributed in the matrix. At least some of the non-superconductive particles comprise either a rare earth transition metal oxide or a barium or strontium transition metal oxide. The non-superconductive particles are ferromagnetic, superparamagnetic, ferrimagnetic or antiferromagnetic at a temperature of 77K. Suitable compositions include a superconductive matrix of YBCO with YFe03 non-superconductive particles distributed in the matrix. The composition allows practical magnetic pinning to be achieved. A composition comprising Y, Nd, Sm, Eu, Gd, Ho or a mixture thereof; Ba; Cu; a rare earth, Sr or Ba; a transition metal; and oxygen in various proportions is also disclosed, as is a method of manufacturing an electrical conductor comprising deposition of a layer of material on a substrate which includes a matrix formed of high temperature superconductive oxide or its precursor.
WIMBUSH STUART [GB]; DRISCOLL JUDITH [GB
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