The featured article this time is advanced online publication in Nature on Superconductivity in FeAs-based layered compounds by Takahashi et al.
This is the first publication in Science/Nature from what I am sure many to follow on this topic, with a few new publications per day appearing on arxiv.
By starting with LaOFeAs compound and doping F at oxygen sites, the
superconducting temperature of 26K is reached under atmospheric pressure. This Tc can be increased up to 43K by applying pressure (maximum of 43K at
4GPa, with the higher pressure decreasing the Tc). This is the highest
non-cuprate Tc observed, and there is already some evidence that the pairing mechanism is non-conventional.