Some materials stay 'super' even when they are incredibly dirty, defying a law of physics that says they should fail.
April 14, 2026
Original Paper
Reduced pair breaking from extended disorder in unconventional superconductors: implications to 4Hb-TaS$_2$
arXiv · 2604.11738
The Takeaway
Standard theory says impurities destroy unconventional superconductivity, but this research shows that if the dirt is 'extended' (chunky) rather than tiny points, the material ignores it. This allows for the creation of robust superconductors that don't need to be chemically perfect to function.
From the abstract
Unconventional superconductivity is generally expected to be strongly suppressed by nonmagnetic disorder, as captured by Abrikosov--Gor'kov (AG) theory. However, several materials, including transition metal dichalcogenides, exhibit signatures of unconventional pairing despite relatively high resistivities, suggesting a breakdown of the conventional relation between momentum relaxation and pair breaking. Here, we study this problem in H-phase transition metal dichalcogenides by computing the dis