Superconducting phase diagram of HS under high magnetic fields.

The discovery of superconductivity at 260 K in hydrogen-rich compounds like LaH re-invigorated the quest for room temperature superconductivity. Here, we report the temperature dependence of the upper critical fields μH(T) of superconducting HS under a record-high combination of applied pressures up to 160 GPa and fields up to 65 T. We find that H(T) displays a linear dependence on temperature over an extended range as found in multigap or in strongly-coupled superconductors, thus deviating from conventional Werthamer, Helfand, and Hohenberg (WHH) formalism.

Crystal Structure of the Superconducting Phase of Sulfur Hydride.

A superconducting critical temperature above 200 K has recently been discovered in HS (or DS) under high hydrostatic pressure1, 2. These measurements were interpreted in terms of a decomposition of these materials into elemental sulfur and a hydrogen-rich hydride that is responsible for the superconductivity, although direct experimental evidence for this mechanism has so far been lacking. Here we report the crystal structure of the superconducting phase of hydrogen sulfide (and deuterium sulfide) in the normal and superconducting states obtained by means of synchrotron X-ray diffraction measurements, combined with electrical resistance measurements at both room and low temperatures.

Phase boundary of hot dense fluid hydrogen.

We investigated the phase transformation of hot dense fluid hydrogen using static high-pressure laser-heating experiments in a laser-heated diamond anvil cell. The results show anomalies in the heating efficiency that are likely to be attributed to the phase transition from a diatomic to monoatomic fluid hydrogen (plasma phase transition) in the pressure range between 82 and 106 GPa. This study imposes tighter constraints on the location of the hydrogen plasma phase transition boundary and suggests higher critical point than that predicted by the theoretical calculations.