Raman studies of lattice–charge–spin coupling in double perovskite SmBaMn2O6

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-10-13 DOI:10.1063/5.0280966

Rea Divina C. Mero, Yu-Ju Liao, Shigeki Yamada, Hsiang-Lin Liu

引用次数: 0

Abstract

The complex phase transitions of SmBaMn2O6 single crystals are investigated using temperature-dependent Raman spectroscopy. Distinct anomalies associated with the charge-orbital ordering are observed in the breathing mode at 614 cm−1, which shows a pronounced enhancement at the high-temperature charge-orbital ordering temperature of 380 K and a splitting into 597 and 631 cm−1 at the low-temperature charge-orbital ordering temperature of 200 K. Furthermore, the Jahn–Teller mode at 480 cm−1 exhibits a blueshift up to 5 cm−1 below the antiferromagnetic spin ordering temperature of 175 K, indicating spin–phonon interaction with a strong coupling constant of 2.5 cm−1. The observed anomalies in phonon frequency, linewidth, and intensity near the phase transition temperatures highlight the importance of lattice–charge–spin interactions in SmBaMn2O6.

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双钙钛矿SmBaMn2O6中晶格-电荷-自旋耦合的拉曼研究

利用温度相关拉曼光谱研究了SmBaMn2O6单晶的复杂相变。在614 cm−1的呼吸模式下观察到明显的电荷轨道有序异常，在380 K的高温电荷轨道有序温度下明显增强，在200 K的低温电荷轨道有序温度下分裂为597和631 cm−1。此外，在480 cm−1的Jahn-Teller模式中，蓝移比175 K的反铁磁自旋有序温度低5 cm−1，表明自旋-声子相互作用具有2.5 cm−1的强耦合常数。在相变温度附近观测到的声子频率、线宽和强度的异常突出了SmBaMn2O6中晶格-电荷-自旋相互作用的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

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