Thermal transport in superconducting niobium nitride: A first-principles study

Magnetoresistance Oscillations in Granular Superconducting Niobium Nitride Nanowires

We report on magnetoresistance oscillations in superconducting NbNx nanowires synthesized through ammonia gas annealing of NbSe3 precursor nanostructures. Though the transverse dimensions of the nanowires are much larger than the superconducting coherence length, the voltage-current characteristics of these nanowires at low temperatures are reminiscent of onedimensional superconductors where qu...

Electronic structure, vibrational spectrum, and thermal properties of yttrium nitride: A first-principles study

“role of Metallurgy in the Thermal Conductivity of Superconducting Niobium”

Superconducting radio frequency (SRF) cavities for particle accelerators are fabricated using high purity niobium to allow for continuous high power operation. A hot-spot generated at a surface defect during accelerator operation can quench superconductivity and limit its performance. Increased heat conduction to the liquid helium bath dissipates hot spots, maintaining performance. Properly tre...

Phonon thermal transport in Bi2Te3 from first principles

Anisotropic Thermal Conductivity of Polycrystalline Niobium for Superconducting Cavities

This study investigates the thermal conductivity Κ of polycrystalline niobium. We recall that superconducting cavities for particle accelerators are made of niobium. And, the thermal conductivity Κ is one of the factors which play an important role in the cooling of these cavities by the surrounding superfluid helium bath. Our experiments revealed a rather unexpected discrepancy in the thermal ...