In 2017 a respected professor told me (a student, presenting a poster on engineering superconductivity in nickelates) "I can't believe you're still trying this, when are you going to give up!"
@nature.comA new family of superconductors is exciting physicists
https://go.nature.com/3Qk3rBk
go.nature.com
‘Unconventional’ nickel superconductor excites physicists
Compounds called nickelates can conduct electricity without resistance well above absolute zero and at ambient pressure.