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• W4307888930 abstract "A B-site disordered double perovskite $mathrm{NdSrCoFe}{mathrm{O}}_{6}$ was successfully synthesized by the conventional sol-gel method. Detailed experimental analyses revealed that $mathrm{NdSrCoFe}{mathrm{O}}_{6}$ crystallizes in the orthorhombic $Pnma$ space group, in which ${mathrm{Co}}^{2+/3+}$ and ${mathrm{Fe}}^{3+/4+}$ ions are randomly distributed at the BBensuremath{'} sites, and ${mathrm{Sr}}^{2+}$ and ${mathrm{Nd}}^{3+}$ ions are respectively ordered at the A and Aensuremath{'} sites in an alternating arrangement along the $c$ direction. $mathrm{NdSrCoFe}{mathrm{O}}_{6}$ has a semimetallic-to-semiconducting transition nature, and a paramagnetic-ferromagnetic (FM) second-order phase transition originating from the complex hybridization between Co $3d$ and O $2p$ states is also found to occur at ${T}_{mathrm{C}}ensuremath{approx}150$ K. Then the spin coupling between ${mathrm{Fe}}^{4+}ensuremath{leftrightarrow}{mathrm{Co}}^{3+}$ and ${mathrm{Fe}}^{3+}ensuremath{leftrightarrow}{mathrm{Co}}^{2+}$ randomly distributed on the B and Bensuremath{'} sites leads to a FM cluster spin-glass behavior with characteristic parameters of $k=0.01, {T}_{mathrm{SG}}=82.7$ K, $zv=1.89$, and ${ensuremath{tau}}_{0}=0.46ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}$ s. Additionally, Griffiths-like phase behavior was observed in the region ${T}_{mathrm{C}}<T<{T}_{mathrm{GP}}$, with ${T}_{mathrm{GP}}=245$ K, consistent with the power law exponent of $ensuremath{lambda}=0.74$. The maximum isothermal magnetic entropy change $ensuremath{-}mathrm{ensuremath{Delta}}{S}_{M}^{mathrm{max}}ensuremath{approx}1.84phantom{rule{0.16em}{0ex}}mathrm{J}phantom{rule{0.16em}{0ex}}mathrm{k}{mathrm{g}}^{ensuremath{-}1}phantom{rule{0.16em}{0ex}}{mathrm{K}}^{ensuremath{-}1}$ and relative cooling power $ensuremath{approx}43.8phantom{rule{0.16em}{0ex}}mathrm{J}phantom{rule{0.16em}{0ex}}mathrm{k}{mathrm{g}}^{ensuremath{-}1}$ under a field of 40 kOe also indicate a magnetocaloric coupling wherein fitted critical exponents $ensuremath{beta}=1.384, ensuremath{gamma}=0.621$, and $ensuremath{delta}=1.421$ are far from any conventional universality class. Density functional theory calculations demonstrated spin short- and long-range ordering competitions for Fe/Co at BBensuremath{'} sites, which arise predominantly from the stronger negatively charged ligand interaction with Co $3d$ orbitals and the weakest Fe $3d$ orbitals. This unconventional behavior is expected to be the main reason for the experimentally observed magnetic exchange distance decreasing with $J(r)ensuremath{approx}{r}^{ensuremath{-}4.7}$." @default.
• W4307888930 created "2022-11-06" @default.
• W4307888930 creator A5000140082 @default.
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• W4307888930 creator A5089128165 @default.
• W4307888930 date "2022-10-31" @default.
• W4307888930 modified "2023-10-18" @default.
• W4307888930 title "Griffiths-like phase, large magnetocaloric effect, and unconventional critical behavior in the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>NdSrCoFe</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math> disordered double perovskite" @default.
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