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- W3177717907 abstract "We report the thermal expansion, critical behavior, magnetocaloric effect (MCE), and magnetoresistance ($MR$) on the polycrystalline Mn$_{1.4}$Fe$_{3.6}$Si$_{3}$ compound around the ferromagnetic transition. A large negative volume thermal expansion ($alpha_{rm V}sim -20 times 10^{-6}$ K$^{-1}$) is observed across the transition temperature with a strong anisotropic variation of lattice parameters in the $ab$-plane. The anisotropic magnetoelasticity arises from the competition between magnetic ordering and structural deformation which could be responsible for the large MCE ($Delta S_{rm m} simeq -6$ J/Kg-K) across the magnetic transition in this compound. The large and negative $MR$ ($sim -3%$ in 80 kOe) is also observed at the transition temperature which can be attributed to the suppression of spin disorder. Further, the Rhodes-Wolfarth ratio (RWR $> 1$) and identical field dependence of $MR$ and MCE isotherms indicate the itinerant character of the $3d$ electrons. The critical exponents determined from the analysis of magnetization and MCE are consistent with the quasi-two-dimensional (2D) Ising model with long range exchange interactions which decays as $J(r)sim r^{-3.41}$. This unconventional quasi-2D Ising character with long-range interactions can be ascribed to strong $ab$-plane anisotropy and the delocalized $3d$ electrons in the studied compound." @default.
- W3177717907 created "2021-07-19" @default.
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- W3177717907 date "2021-07-20" @default.
- W3177717907 modified "2023-10-16" @default.
- W3177717907 title "Negative thermal expansion and itinerant ferromagnetism in Mn1.4Fe3.6Si3" @default.
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- W3177717907 doi "https://doi.org/10.1063/5.0055695" @default.
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