Spin-phonon coupling in the incommensurate magnetic ordered phase of orthorhombic TmMnO3
Spin-phonon coupling in the incommensurate magnetic ordered phase of orthorhombic TmMnO3
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DOI：
10.1016/j.jpcs.2021.110044
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发表时间：
2021-03
影响因子：
4
通讯作者：
B. Araújo;Á. Arévalo-López;C. Santos;J. Attfield;C. Paschoal;A. Ayala
中科院分区：
文献类型：
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作者：
B. Araújo;Á. Arévalo-López;C. Santos;J. Attfield;C. Paschoal;A. Ayala
自从在钙钛矿TbMnO 3中发现有趣的特性以来，对具有强磁电耦合的材料的研究一直很激烈。在锰基钙钛矿家族（RMnO 3）中，磁序和电序共存于畸变钙钛矿TmMnO 3的正交相中。反铁磁相诱导铁电性，导致II型多铁性行为。尽管已经报道了正交RMnO 3家族其他成员的拉曼活性声子的温度依赖性行为，但有关正交TmMnO 3的信息却很少。本文采用高温高压处理的方法制备了正交相TmMnO_3块状样品。合成样品的结构和磁性进行了分析相确认。TmMnO 3的变温拉曼谱表明，在44 K附近，无公度反铁磁有序相中存在较弱的自旋-声子耦合.拉曼光谱也是敏感的磁过渡从无公度的E型反铁磁相，其中的频率重整化由于自旋-声子耦合消失。这一特点表明存在的轨道自旋声子耦合的基础上的磁有序的低温相。
The search for materials with strong magnetoelectric coupling has been intense since interesting properties were discovered in the perovskite TbMnO3. Among the manganese-based perovskite family (RMnO3), magnetic and electric orders coexist in the orthorhombic phase of the distorted perovskite TmMnO3. The antiferromagnetic phase induces ferroelectricity, leading to type–II multiferroic behavior. Although the temperature-dependent behavior of the Raman-active phonons of other members of the orthorhombic RMnO3family was already reported, little information about orthorhombic TmMnO3has been published. In this paper, bulk samples of orthorhombic TmMnO3were obtained through HPHT treatment. Structural and magnetic properties of the synthesized samples were analyzed for phase confirmation. Temperature-dependent Raman spectra of bulk orthorhombic TmMnO3revealed weak spin-phonon coupling in the incommensurate antiferromagnetic ordered phase around 44 K. Raman spectra are also sensitive to the magnetic transition from the incommensurate to E-type antiferromagnetic phase, where the frequency renormalization due to the spin-phonon coupling vanishes. This feature shows the existence of an orbital-spin-phonon coupling based on the magnetic ordering of the low-temperature phase.