Spin-phonon coupling in melanothallite Cu2OCl2
Spin-phonon coupling in melanothallite Cu2OCl2
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DOI：
10.1063/1.5054928
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发表时间：
2018-11-26
影响因子：
4
通讯作者：
Ayala, A. P.
中科院分区：
文献类型：
--
作者：
Araujo, B. S.;Arevalo-Lopez, A. M.;Ayala, A. P.
由于在碲基锰氧化物中发现了有趣的磁介电性质，人们一直在寻找具有高居里温度和强磁介耦合的新型磁介质多铁材料。最近有报道称，合成的黑钨矿Cu2OCl2是一种自旋驱动型多铁磁电介质，其Neel温度约为70K，与其他自旋驱动型铁电材料相比，这是一个异常高的临界温度。本文用拉曼光谱研究了Cu2OCl2中的自旋-声子耦合，结果表明，Cu2OCl2的无公度磁结构引起的自旋-声子耦合符合平均场理论，与钙钛矿化合物的几种伸缩模式所观察到的自旋-声子耦合相似。由AIP出版公司出版。
Since interesting magnetodielectric properties were discovered in terbium-based manganites, the search for new magnetodielectric multiferroic materials with high Curie temperatures and strong magnetodielectric coupling has been intense. Recently, it was reported that synthetic melanothalllite, the oxahalide Cu2OCl2, is a spin-driven multiferroic magnetodielectric with Neel temperature around 70 K, which is an exceptionally high critical temperature compared to other spin-driven ferroelectric materials. In this letter, we have probed the spin-phonon coupling in Cu2OCl2 by Raman spectroscopy, showing that the incommensurate magnetic structure induces a spin-phonon coupling in accord with the mean field theory and similar to the one observed in several stretching modes of perovskite compounds. Published by AIP Publishing.