Superconducting gap of H3S measured by electron tunneling spectroscopy

Hydrogen-rich superconductors are well known for their unprecedented high critical temperatures. While most studies of these superconductors have focused on their macroscopic superconducting properties, microscopic insights into the pairing mechanism remain unclear due to experimental challenges. Here I report on the development of the electron tunneling technique at megabar pressures and its application to H3S and D3S to measure the superconducting gap. The fully gapped structure as well as the isotope effect in these compounds provide direct experimental evidence for superconductivity from a microscopic perspective and validate the phonon-mediated mechanism of superconducting pairing.

If you would like to meet with Feng during his visit, please contact Susan LaMoreaux.