Metallic sulphur. "Electronic" mechanism of superconductivity?
Abstract
It is shown that the rapid increase of the superconducting transition temperature Tc of sulphur with increasing pressure above 93 GPa does not contradict with some hypothetical ``electronic'' mechanism of superconductivity with participation of the electron interaction energy fluctuations. Such ``electronic'' mechanism is supposed to be intrinsic property of the molecular condensates and corresponds to very high Tc. The low Tc of sulphur (10 -17)K is likely connected with the magnetic properties of the sulphur atoms and molecules. The equation of state for sulphur is obtained. The molar volume of sulphur at metallization is 10 cm3/mol. The principal difference between the ''physical'' and the ''chemical'' type bonds are discussed. Under some pressure one bond type is changed by another andTcmay have an extremum (transition from the Bose condensation to the BCS superconductivity).
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