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arXiv 0905.1891cond-mat.str-elcond-mat.mtrl-sci
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多铁性BiFeO3晶体中的极性声子和自旋激发耦合

Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals

P. Rovillain, M. Cazayous, Y. Gallais, A. Sacuto, R. P. S. M. Lobo, D. Lebeugle, D. Colson

摘要:

BiFeO3单晶的拉曼散射测量显示了磁序和晶格振动之间的重要耦合。声子的温度演化表明,最低能量的E和A1声子模式耦合到自旋顺序的Neel温度。此外,在E声子和磁振子中同时观察到与自旋重取向相关的低温异常。这些结果表明,磁致伸缩在BiFeO 3中起着重要的作用。

英文摘要:

Raman scattering measurements on BiFeO3 single crystals show an important coupling between the magnetic order and lattice vibrations. The temperature evolution of phonons shows that the lowest energy E and A1 phonon modes are coupled to the spin order up to the Neel temperature. Furthermore, low temperature anomalies associated with the spin re-orientation are observed simultaneously in both the E phonon and the magnon. These results suggest that magnetostriction plays an important role in BiFeO3.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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