多铁性材料BiFeO3中反铁磁相变的双声子耦合
Two-phonon coupling to the antiferromagnetic phase transition in multiferroic BiFeO3
摘要：
在多铁性BiFeO 3薄膜和单晶中发现了一个中心在1000-1300 cm-1的与共振增强的双声子喇曼散射有关的强带。一个强烈的异常，在这个带发生在反铁磁尼尔温度。该谱带由三个峰组成，分配给2A 4、2 E8和2 E9拉曼模式。虽然所有三个峰被发现是敏感的反铁磁相变，2 E8模式，特别是，几乎消失在TN加热，表明一个强大的自旋两声子耦合BiFeO 3。
英文摘要：
A prominent band centered at around 1000-1300 cm-1 and associated with resonant enhancement of two-phonon Raman scattering is reported in multiferroic BiFeO3 thin films and single crystals. A strong anomaly in this band occurs at the antiferromagnetic Neel temperature. This band is composed of three peaks, assigned to 2A4, 2E8, and 2E9 Raman modes. While all three peaks were found to be sensitive to the antiferromagnetic phase transition, the 2E8 mode, in particular, nearly disappears at TN on heating, indicating a strong spin-two phonon coupling in BiFeO3.
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