Dielectric and Raman spectroscopy measurements across structural phase transition in multiferroic HoFe3(BO3)4 single crystal

A. Tripathy, K. Gautam, K. Dey, A. Ahad, I. Gudim, V. Sathe, D. Shukla
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Abstract

We report on findings in the HoFe3(BO3)4 single crystal across structural phase transition by the dielectric and Raman spectroscopic measurements. In most of the compounds of RFe3(BO3)4 (R=La-Lu) family low temperature P3121 structure is introduced through structural phase transition (from space group R32). Temperature dependent dielectric measurements on the HoFe3(BO3)4 crystal depicts a step like feature at the structural phase transition at ∼366 K. The Raman spectroscopy study also confirms the structural transition around this temperature. A clear signature of structural transition is reflected in the Raman spectra, mainly in the frequency range (200-400 cm-1). Appearance of new Raman modes below the transition temperature also indicates that the transition is from a high symmetry phase to a low symmetry phase.We report on findings in the HoFe3(BO3)4 single crystal across structural phase transition by the dielectric and Raman spectroscopic measurements. In most of the compounds of RFe3(BO3)4 (R=La-Lu) family low temperature P3121 structure is introduced through structural phase transition (from space group R32). Temperature dependent dielectric measurements on the HoFe3(BO3)4 crystal depicts a step like feature at the structural phase transition at ∼366 K. The Raman spectroscopy study also confirms the structural transition around this temperature. A clear signature of structural transition is reflected in the Raman spectra, mainly in the frequency range (200-400 cm-1). Appearance of new Raman modes below the transition temperature also indicates that the transition is from a high symmetry phase to a low symmetry phase.
多铁HoFe3(BO3)4单晶结构相变的介电和拉曼光谱测量
本文报道了用介电光谱和拉曼光谱测量HoFe3(BO3)4单晶跨结构相变的发现。在大多数RFe3(BO3)4 (R=La-Lu)族化合物中,低温P3121结构是通过结构相变(来自空间族R32)引入的。对HoFe3(BO3)4晶体的温度相关介电测量显示,在~ 366 K时,结构相变呈阶梯状。拉曼光谱研究也证实了在这个温度附近的结构转变。拉曼光谱反映了结构跃迁的明显特征,主要在200-400 cm-1的频率范围内。低于转变温度的新拉曼模式的出现也表明转变是从高对称相到低对称相。本文报道了用介电光谱和拉曼光谱测量HoFe3(BO3)4单晶跨结构相变的发现。在大多数RFe3(BO3)4 (R=La-Lu)族化合物中,低温P3121结构是通过结构相变(来自空间族R32)引入的。对HoFe3(BO3)4晶体的温度相关介电测量显示,在~ 366 K时,结构相变呈阶梯状。拉曼光谱研究也证实了在这个温度附近的结构转变。拉曼光谱反映了结构跃迁的明显特征,主要在200-400 cm-1的频率范围内。低于转变温度的新拉曼模式的出现也表明转变是从高对称相到低对称相。
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