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- W4328130044 abstract "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 do not exhibit this effect at ambient conditions but upon application of pressure even Ni-rich compositions show low thermal expansion, thus called the pressure induced invar effect. We investigate the pressure induced invar effect for Fe$_{x}$Ni$_{1-x}$ for x = 0.64, 0.50, 0.25 by performing a large set of supercell calculations, taking into account noncollinear magnetic states. We observe anomalies in the equation of states for the three compositions. The anomalies coincide with magnetic transitions from a ferromagnetic state at high volumes to a complex magnetic state at lower volumes. Our results can be interpreted in the model of noncollinear magnetism which relates the invar effect to increasing contribution of magnetic entropy with pressure." @default.
- W4328130044 created "2023-03-22" @default.
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- W4328130044 date "2023-03-21" @default.
- W4328130044 modified "2023-10-14" @default.
- W4328130044 title "First-principles theory of the pressure-induced invar effect in FeNi alloys" @default.
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- W4328130044 doi "https://doi.org/10.1103/physrevb.107.104422" @default.
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