详细信息    查看全文

• 作者：Evgeniya Moshkina ; Alexander Krylov ; Svetlana Sofronova ; Irina Gudim ; Vladislav Temerov
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：December 7, 2016
• 年：2016
• 卷：16
• 期：12
• 页码：6915-6921
• 全文大小：450K
• ISSN：1528-7505

文摘

Sm_1–xLa_xFe₃(BO₃)₄ (x = 0, 0.75) single crystals were synthesized using the flux method. The crystal nucleation procedure and flux parameters are reported. Conditions for growing the Sm_1–xLa_xFe₃(BO₃)₄ (x = 0, 0.75) single crystals are described. The prepared crystals were studied by Raman spectroscopy in the temperature range of T = 10–300 K. The spectral region corresponding to temperatures of T = 10–55 K, which involves the temperatures of the magnetic phase transition T_N = 32 K for x = 0 and T_N = 31 K for x = 0.75, was thoroughly analyzed. Anomalies related to the magnetic ordering established in both compounds were found. The main changes occur in the low-wavenumber region (up to 100 cm^–1), where the mode corresponding to magnon scattering arises. This mode is shown to have the internal structure indicative of the occurrence of unstable vibrations (40–80 cm^–1). The results obtained are analyzed by calculating the empirical lattice dynamics in Sm_1–xLa_xFe₃(BO₃)₄ with x = 0 and x = 1.