Superconducting properties of boron-doped diamond


Superconducting properties of boron-doped diamond

Uhlarz, M.; Skrotzki, R.; Papageorgiou, T.; Wosnitza, J.; Dubrovinskaia, N.; Dubrovinsky, L.; Miyajima, N.; Bosak, A.; Krisch, M.; Braun, H. F.; Wirth, R.

The question of the nature of superconductivity in boron-doped diamond (synthesized at high pressures and high temperatures) is still open. Here we present consistent measurements of resistivity and specific-heat on two samples containing pure 13C and 12C, revealing a 0.2 K shift of the superconducting transition temperature Tc. Hallcoefficient measurements confirm equal charge-carrier concentrations in both samples. The results are interpreted as a carbon-isotope effect more than two times larger than expected from the most simple BCS model for phonon-mediated superconductivity. Additional analyses of microstructure and exact boron content of the superconducting material show the presence of highly boron-enriched amorphous boundaries between the grains. For these investigations highresolution transmission-electron microscopy and electron-energy-loss spectroscopy were used.

  • Poster
    DPG Frühjahrstagung der Sektion Kondensierte Materie (SKM) 2009, 22.-27.03.2009, Dresden, Deutschland
  • Poster
    9th Conference on Materials and Mechanisms of Superconductivity (M2S), 07.-12.09.2009, Tokyo, Japan

Permalink: https://www.hzdr.de/publications/Publ-12605
Publ.-Id: 12605