Typically, modern high temperature superconductors are solids which consist of a stack of thin layers, similar to the pages in a book. These layers are conductive and transport electricity. However, no electricity can flow from layer to layer at room temperature since those electrons which are responsible for the current flow can only move freely in the respective layer. If, however, such a layer stack is cooled to the right temperature, then superconductivity occurs along all directions. But there is one difference: While the electrons flow inside a layer without any resistance, these electrons can now also move from layer to layer by "tunneling" through the insulating areas located between these layers. Dr. Gensch explains: "Already the geometry suggests that the mechanisms of superconductivity are different inside and between the layers. We were interested in how the electrons transport this property vertically from layer to layer and/or whether we would be able to control this transport without disrupting the superconductivity in the horizontal layers. Read more at: http://phys.org/news/2013-04-tsunami-superconductor.html#jCp
