Then again, Tc means different things in different fields. E.g. critical temperatures for all kinds of critical phase transitions. Note that the google search you posted above gives results for various phase transitions many of which are not superconducting phase transitions. I also was lost when I saw the original query.
Or perhaps more generally for materials with a high Curie temperature, https://en.wikipedia.org/wiki/Curie_temperature
Disclaimer: I know absolutely nothing about this field.