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• W3093264025 abstract "Structural, electronic, and magnetic properties of modified cubic spinel compound ${mathrm{LiNi}}_{0.5}{mathrm{Mn}}_{1.5}{mathrm{O}}_{4}$ are studied via x-ray diffraction, resistivity, dc and ac magnetization, heat capacity, neutron diffraction, $^{7}mathrm{Li}$ nuclear magnetic resonance, magnetocaloric effect, magnetic relaxation, and magnetic memory effect experiments. We stabilized this compound in a cubic structure with space group $P{4}_{3}32$. It exhibits semiconducting character with an electronic band gap of $mathrm{ensuremath{Delta}}/{k}_{mathrm{B}}ensuremath{simeq}0.4$ eV. The interaction within each ${mathrm{Mn}}^{4+}$ and ${mathrm{Ni}}^{2+}$ sublattice and between ${mathrm{Mn}}^{4+}$ and ${mathrm{Ni}}^{2+}$ sublattices is found to be ferromagnetic (FM) and antiferromagnetic (AFM), respectively. This leads to the onset of a ferrimagnetic transition at ${T}_{mathrm{C}}ensuremath{simeq}125$ K. The reduced values of frustration parameter ($f$) and ordered moments reflect magnetic frustration due to competing FM and AFM interactions. From the $^{7}mathrm{Li}$ nuclear magnetic resonance shift vs susceptibility plot, the average hyperfine coupling between $^{7}mathrm{Li}$ nuclei and ${mathrm{Ni}}^{2+}$ and ${mathrm{Mn}}^{4+}$ spins is calculated to be $ensuremath{sim}672.4$ Oe/${ensuremath{mu}}_{mathrm{B}}$. A detailed critical behavior study is done in the vicinity of ${T}_{mathrm{C}}$ using modified-Arrott plot, Kouvel-Fisher plot, and universal scaling of magnetization isotherms. The magnetic phase transition is found to be second order in nature and the estimated critical exponents correspond to the three-dimensional XY universality class. A large magnetocaloric effect is observed with a maximum value of isothermal change in entropy $mathrm{ensuremath{Delta}}{S}_{m}ensuremath{simeq}ensuremath{-}11.3$ J/Kg K and a maximum relative cooling power of $text{RCP}ensuremath{simeq}604$ J/Kg for 9 T magnetic field change. The imaginary part of the ac susceptibility depicts a strong frequency-dependent hump at $T={T}_{mathrm{f}2}$ well below the blocking temperature ${T}_{mathrm{b}}ensuremath{simeq}120$ K. The Arrhenius behavior of frequency dependent ${T}_{mathrm{f}2}$ and the absence of zero-field-cooled memory confirm the existence of superparamagnetism in the ferrimagnetically ordered state." @default.
• W3093264025 created "2020-10-22" @default.
• W3093264025 creator A5001249993 @default.
• W3093264025 creator A5006349871 @default.
• W3093264025 creator A5015977647 @default.
• W3093264025 creator A5030417099 @default.
• W3093264025 creator A5030877926 @default.
• W3093264025 creator A5062004162 @default.
• W3093264025 creator A5062207571 @default.
• W3093264025 date "2020-10-27" @default.
• W3093264025 modified "2023-10-16" @default.
• W3093264025 title "Unconventional superparamagnetic behavior in the modified cubic spinel compound <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>LiNi</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mrow><mml:mn>1.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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