Superconductivity of hexagonal heavily-boron doped silicon carbide

Details Superconductivity of hexagonal heavily-boron doped silicon carbide Superconductivity of hexagonal heavily-boron doped silicon carbide

2008-08-02

arxiv.org/abs/0808.0231v1

Physics

Condensed Matter

Superconductivity

4 pages, 1 figures

Scientific paper

10.1088/1742-6596/150/5/052130

In 2004 the discovery of superconductivity in heavily boron-doped diamond (C:B) led to an increasing interest in the superconducting phases of wide-gap semiconductors. Subsequently superconductivity was found in heavily boron-doped cubic silicon (Si:B) and recently in the stochiometric ''mixture'' of heavily boron-doped silicon carbide (SiC:B). The latter system surprisingly exhibits type-I superconductivity in contrast to the type-II superconductors C:B and Si:B. Here we will focus on the specific heat of two different superconducting samples of boron-doped SiC. One of them contains cubic and hexagonal SiC whereas the other consists mainly of hexagonal SiC without any detectable cubic phase fraction. The electronic specific heat in the superconducting state of both samples SiC:B can be described by either assuming a BCS-type exponentional temperature dependence or a power-law behavior.

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