Room Temperature Superconductivity Claimed for Cuprates� - Technology Review: So at low temperatures, the cuprate acts like a normal superconductor. As the temperature rises, it goes through a first transition and loses its zero resistance while maintaining the Meisner effect. Then as the temperature rises further, it goes through a second transition in which the Meisner effect disappears and the material becomes an ordinary conductor. In underdoped yttrium barium copper oxide (YBCO), the first transition occurs at 85K while the second at over 200K...
They think that these cuprates consist of two components with different transition temperatures: the component with the higher transition temperature forms islands in a matrix with a lower transition temperature.
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