https://research.ibm.com/publications/bulk-superconductivity-at-125-k-in-tl2ca2ba2cu3ox
Bulk superconductivity at 125 K in Tl2Ca2Ba2Cu3Ox for Physical Review Letters - IBM Research
Bulk superconductivity at 125 K in Tl2Ca2Ba2Cu3Ox for Physical Review Letters by S.S.P. Parkin et al.