Dependence of the superconducting transition temperature on the doping level in single crystalline diamond films

Details Dependence of the superconducting transition temperature on the doping level in single crystalline diamond films Dependence of the superconducting transition temperature on the doping level in single crystalline diamond films

2004-08-24

arxiv.org/abs/cond-mat/0408517v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.93.237005

Homoepitaxial diamond layers doped with boron in the 10^20-10^21 /cm3 range are shown to be type II superconductors with sharp transitions (~0.2K) at temperatures increasing from 0 to 2.1 K with boron contents. The critical concentration for the onset of superconductivity is about 5-7 10^20 /cm3, close to the metal-insulator transition. The H-T phase diagram has been obtained from transport and a.c. susceptibility measurements down to 300mK. These results bring new quantitative constraints on the theoretical models proposed for superconductivity in diamond.

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