First Principles Theory of the Pressure Induced Invar Effect in FeNi Alloys

Amanda Ehn, Björn Alling, Igor A. Abrikosov

The Fe${}_{0.64}$Ni${}_{0.36}$ alloy exhibits an anomalously low thermal expansion at ambient conditions, an effect that is known as the invar effect. Other Fe${}_x$Ni${}_{1-x}$ alloys d…