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首页> 外文期刊>Physical review >Composition-dependent spin-phonon coupling in mixed crystals of the multiferroic manganite Eu_(1-x)Y_xMnO_3 (0≤x≤0.5) studied by Raman spectroscopy
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Composition-dependent spin-phonon coupling in mixed crystals of the multiferroic manganite Eu_(1-x)Y_xMnO_3 (0≤x≤0.5) studied by Raman spectroscopy

机译：拉曼光谱研究多铁锰矿Eu_（1-x）Y_xMnO_3（0≤x≤0.5）混合晶体中依赖成分的自旋声子耦合

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摘要

Yttrium substitution in Eu_(1-x)Y_xMnO_3 allows a quasicontinuous tuning of the lattice and magnetic properties of this multiferroic manganite without magnetic interference of rare-earth ions. In order to investigate the composition dependence of the spin-phonon coupling we employ polarized Raman scattering of orthorhombic mixed crystals of Eu_(1-x)Y_xMnO_3 (0≤x≤0.5) in the 10-300 K temperature range. Phonon frequency shifts and mode-mixing effects occur, depending on the average rare-earth ion radius determined by the concentration of Eu~(3+) and Y~(3+). Moreover, we observe a strong spin-phonon coupling with systematic composition dependence. It manifests itself as a mode-specific softening of the phonon modes in the temperature range of the magnetic ordered phases. The spin-phonon coupling is weakened for increasing Y contents but remains nonzero also in the incommensurate spiral magnetic phase, which occurs for 0.3≤x≤0.5. Thus for this class of manganites we report the observation of spin-phonon coupling in an ordered magnetic phase without ferromagnetic ordering within the MnO_2 plane. Additionally for known sublattice magnetization quantitative values of the spin-phonon coupling constant are derived. Our results prove the suitability of phonons as a sensitive probe for the spin-spin correlation.
机译：Eu_（1-x）Y_xMnO_3中的钇置换使得该多铁锰矿的晶格和磁性能得以准连续调谐，而不会受到稀土离子的磁性干扰。为了研究自旋声子耦合的成分依赖性，我们在10-300 K的温度范围内采用Eu_（1-x）Y_xMnO_3（0≤x≤0.5）的正交各向异性混合晶体的偏振拉曼散射。取决于Eu〜（3+）和Y〜（3+）的浓度确定的平均稀土离子半径，会发生声子频移和模式混合效应。此外，我们观察到强自旋声子耦合与系统组成依赖。它表现为在磁有序相的温度范围内，声子模式的特定于模式的软化。自旋声子耦合会随着Y含量的增加而减弱，但在不相称的螺旋磁相中也会保持非零，这在0.3≤x≤0.5时会发生。因此，对于此类锰矿，我们报告了在有序磁相中自旋声子耦合的观察，而在MnO_2平面内没有铁磁有序。另外，对于已知的亚晶格磁化强度，得出了自旋声子耦合常数的定量值。我们的结果证明了声子适合作为自旋-自旋相关的灵敏探针。

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