Another bunch of papers on the arxiv (1, 2, 3, 4, 5). The last one is particularly interesting - the group reports that replacing lanthanum with samarium boosts Tc up to 43 K. This is the first non-cuprate with a transition temperature that high. Again, it's a long way from room temperature, but the fact that there's a system besides the cuprates that shows transition temperatures this high is exciting. This may give us more clues to the mechanism at work - what is the normal state like? Are these doped Mott insulators? Do they have a pseudogap? What is the pairing symmetry?