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• W2012167440 abstract "We report on the structural instability of ${text{Ni}}_{2}text{MnAl}$ from calorimetry measurements and inelastic neutron scattering. The acoustic and optical phonon dispersions along the high-symmetry $[ensuremath{xi}00]$, $[ensuremath{xi}ensuremath{xi}0]$, and $[ensuremath{xi}ensuremath{xi}ensuremath{xi}]$ directions have been interpolated from the normal modes of vibration using the Born--von K'arm'an model. The tendency of ${text{Ni}}_{2}text{MnAl}$ to undergo a martensitic transformation shows up in the anomalous phonon softening of the particular ${text{TA}}_{2}[ensuremath{xi}ensuremath{xi}0]$ phonons in the $ensuremath{xi}$ range 0.1--0.25 rlu of two different crystals. The phonon frequencies of this branch scale inversely with the valence electron concentration in good agreement with ab initio calculations. Contrary to the prediction of first-principles calculations in the Heusler $text{L}{2}_{1}{text{-Ni}}_{2}text{MnAl}$, no anomaly is seen in the optical phonons measured in $text{B}2{text{-Ni}}_{2}text{MnAl}$. The anomalous ${text{TA}}_{2}[ensuremath{xi}ensuremath{xi}0]$ phonon softening is not enhanced below room temperature when ${text{Ni}}_{2}text{MnAl}$ orders in the antiferromagnetic state." @default.
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• W2012167440 date "2008-09-16" @default.
• W2012167440 modified "2023-09-25" @default.
• W2012167440 title "Interplay of structural instability and lattice dynamics in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ni</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mtext>MnAl</mml:mtext></mml:mrow></mml:math>" @default.
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• W2012167440 doi "https://doi.org/10.1103/physrevb.78.104110" @default.
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