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- W3020375619 abstract "Abstract The nature of the magnetic transition, critical scaling of magnetization, and magnetocaloric effect in Mn 1+ x Fe 4− x Si 3 ( x = 0 to 1) are studied in detail. Our measurements show no thermal hysteresis across the magnetic transition for the parent compound which is in contrast with the previous report and corroborate the second order nature of the transition. The magnetic transition could be tuned continuously from 328 K to 212 K with Mn substitution at the Fe site. The Mn substitution leads to a linear increase in the unit cell volume and a slight reduction in the effective moment. A detailed critical analysis of the magnetization data for x = 0.0 and 0.2 is performed in the critical regime using the modified Arrott plots, Kouvel-Fisher plot, universal curve scaling, and scaling analysis of magnetocaloric effect. The magnetization isotherms follow modified Arrott plots with critical exponent ( β $$simeq $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mo>≃</mml:mo></mml:math> 0.308, γ $$simeq $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mo>≃</mml:mo></mml:math> 1.448, and δ $$simeq $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mo>≃</mml:mo></mml:math> 5.64) for the parent compound ( x = 0.0) and ( β $$simeq $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mo>≃</mml:mo></mml:math> 0.304, γ $$simeq $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mo>≃</mml:mo></mml:math> 1.445, and δ $$simeq $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mo>≃</mml:mo></mml:math> 5.64) for x = 0.2. The Kouvel-Fisher and universal scaling plots of the magnetization isotherms further confirm the reliability of our critical analysis and values of the exponents. These values of the critical exponents are found to be same for both the parent and doped samples which do not fall under any of the standard universality classes. The exchange interaction decays as J ( r ) ~ r −3.41 following the renormalization group theory and the observed critical exponents correspond to lattice dimensionality d = 2, spin dimensionality n = 1, and the range of interaction σ = 1.41. This value of σ (<2) indicates long-range interaction between magnetic spins. A reasonable magnetocaloric effect Δ S m $$simeq $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mo>≃</mml:mo></mml:math> −6.67 J/Kg-K and −5.84 J/Kg-K for x = 0.0 and 0.2 compounds, respectively, with a huge relative cooling power ( RCP ~ 700 J/Kg) for 9 T magnetic field change is observed. The universal scaling of magnetocaloric effect further mimics the second order character of the magnetic transition. The obtained critical exponents from the critical analysis of magnetocaloric effect agree with the values deduced from the magnetic isotherm analysis." @default.
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- W3020375619 date "2020-04-24" @default.
- W3020375619 modified "2023-10-16" @default.
- W3020375619 title "Critical behavior and magnetocaloric effect across the magnetic transition in Mn1+xFe4−xSi3" @default.
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- W3020375619 doi "https://doi.org/10.1038/s41598-020-63223-0" @default.
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