Superconductivity in high Debye temperature material

Abstract The theoretical upper limit of the critical temperature of superconducting materials is discussed. It is concluded that a metal that does not have a high Debye temperature (as do metallic H, B, Be or their alloys) cannot become a high Tc superconductor. Various attempts at enhancing the Tc of Be by quench condensing with various elements, by coevaporation with Li and by treatment in an alloyed form : Be 22 Re, are presented. Probably for metallurgical reasons, we were unable to approach the predicted maximum critical temperature but believe we have somewhat clarified the question and the field remains promising.

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