CBSE Class 12-science Answered
Red , black or white - which one is superconducting.
Asked by Praveen Kumar | 02 May, 2014, 07:56: PM
Expert Answer
Black phosphorous is superconducting. Superconductivity is observed when pressure is increased at liquid-helium temperature.
Maximum onset Tc was near 13 K. The anomalous superconductivity may be explained in terms of excitonic mechanism.
An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force. It is an electrically neutral quasiparticle that exists in insulators, semiconductors and in some liquids.
Answered by | 05 May, 2014, 11:05: AM
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