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- W2264152021 abstract "Dynamical properties of the lattice structure were studied by optical spectroscopy in $A$Cr${}_{2}$O${}_{4}$ chromium spinel oxide magnetic semiconductors over a broad temperature region of $T=10$--335 K. The systematic change of the $A$-site ions ($A=$ Mn, Fe, Co, Ni and Cu) showed that the occupancy of 3$d$ orbitals on the $A$ site has strong impact on the lattice dynamics. For compounds with orbital degeneracy (FeCr${}_{2}$O${}_{4}$, NiCr${}_{2}$O${}_{4}$, and CuCr${}_{2}$O${}_{4}$), clear splitting of infrared-active phonon modes and/or activation of silent vibrational modes have been observed upon the Jahn-Teller transition and at the onset of the subsequent long-range magnetic order. Although MnCr${}_{2}$O${}_{4}$ and CoCr${}_{2}$O${}_{4}$ show multiferroic and magnetoelectric character, no considerable magnetoelasticity was found in spinel compounds without orbital degeneracy as they closely preserve the high-temperature cubic spinel structure even in their magnetic ground state. Aside from lattice vibrations, intra-atomic 3$d$-3$d$ transitions of the $A$${}^{2+}$ ions were also investigated to determine the crystal field and Racah parameters and the strength of the spin-orbit coupling." @default.
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- W2264152021 date "2013-02-20" @default.
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- W2264152021 title "Magnetoelasticity in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>A</mml:mi></mml:math>Cr<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>spinel oxides (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><…" @default.
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- W2264152021 doi "https://doi.org/10.1103/physrevb.87.064416" @default.
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