A breakthrough 'room temperature' magnetic discovery was just revealed to be a total fluke.
April 17, 2026
Original Paper
Revisiting apparent ideal diamagnetism at ambient conditions in graphene-n-heptane-permalloy systems
arXiv · 2604.14395
The Takeaway
In the world of physics, finding a material that repels magnets at room temperature is the ultimate prize. This group previously claimed they had done it, but they just issued a massive 'never mind' retraction. It turns out the magnetic effect they saw was not coming from the material itself, but from a sneaky redistribution of the magnetic field in their setup. It is a humbling moment for science that highlights how easily we can be fooled by our own instruments. This keeps the quest for room-temperature superconductors honest and underscores why extraordinary claims require extraordinary evidence.
From the abstract
We previously reported apparent ideal diamagnetism at ambient conditions in a graphene-n-heptane-permalloy system. At the same time, the experiments revealed inconsistent behavior, including signal freezing and occasional paramagnetic responses. Further measurements performed without graphene produced similar signals, indicating that graphene is not responsible for the observed effects. The results suggest that magnetic field redistribution caused by inhomogeneities in the permalloy foil and exp