Exciton Mechanism for Superconductivity

Equation 31 shows that the maximum superconducting transition temperature expected in the BCS theory is limited by the Debye temperature. This temperature plays a central role because the distortion ofthe lattice in response 

Because fioie and Ve may be quite large, high superconductors (Tc 300 K) were predicted. 

In the past decade numerous new materials were synthesized in an effort to realize such one-dimensional systems, however no success has ever been reported (267, 420, 429). Recently, the model has been challenged on some theoretical grounds (85,580). However, the potential scientific and technological (231) impact of a superconductor with Tc 3(X)°K has sustained interest in this mechanism (484). 

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