Dependence of the Superconducting Transition Temperature on the Doping Level in Single-Crystalline Diamond Films
Résumé
Homoepitaxial diamond layers doped with boron in the 1020-1021 cm 3 range are shown to be type II superconductors with sharp transitions ( 0:2 K) at temperatures increasing from 0 to 2.1 K with boron contents. The critical concentration for the onset of superconductivity in those 001-oriented singlecrystalline films is about 5-7 1020 cm 3. The H T phase diagram has been obtained from transport and ac-susceptibility measurements down to 300 mK.
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