The main topic of this book is unconventional superconductors which include the metal hydrides, organic superconductors, graphite and other carbon-based systems. Graphite and carbon-based materials are currently considered most intriguing in that they show both superconductivity (including the possibility of high or even extra high temperature superconductivity) and magnetism and they are of considerable topical interest. The book carries extended articles on tunnelling and magno-tunelling studies giving new insights into superconductivity of curates and of unconventional systems. The five chapters comprising the book have been contributed by active and renowned researchers from six countries.