HN has a search function (bottom of the page, not ideal but the search itself works quite well), type in superconductor, then select order by date. That will give you the stories as posted in reverse order.

Or click here: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...

Especially the first two threads (I think those have the highest scores for "superconductor" on HN).