Effects of carbon doping on superconductivity in magnesium diboride

Superconducting properties of carbonaceous chemical doped MgB2

The discovery of superconductivity in magnesium diboride (MgB2: 39 K, in January 2001) (Nagamatsu et al., 2001) has generated enormous interest and excitement in the superconductivity community and the world in general, but especially among researchers into superconductivity in non-oxide and boron related compounds.

Superconductivity of Magnesium Diboride: Theoretical Aspects

Effects of two-band superconductivity on the flux-line lattice in magnesium diboride.

We present neutron scattering from the flux line lattice (FLL) in MgB2. Between 0.5 and 0.9 T the FLL undergoes a 30 degrees reorientation, and simultaneously the scattered intensity falls sharply consistent with the weaker superconducting pi band being suppressed with increasing field. We speculate that the pi and sigma bands favor different FLL orientations, and that the reorientation is driv...

Superconducting Properties of Graphene Doped Magnesium Diboride

Why magnesium diboride is not described by anisotropic Ginzburg-Landau theory.

It is well established that the superconductivity in the recently discovered superconducting compound MgB2 resides in the quasi-two-dimensional band (sigma band) and three-dimensional band (pi band). We demonstrate that, due to such band structure, the anisotropic Ginzburg-Landau theory practically does not have a region of applicability, because gradient expansion in the c direction breaks dow...