Magnons and crystal-field transitions in hexagonal RMnO3 (R = Er, Tm, Yb, Lu) single crystals
Magnons and crystal-field transitions in hexagonal RMnO3 (R = Er, Tm, Yb, Lu) single crystals
复制标题
DOI：
10.1103/physrevb.85.144422
复制
发表时间：
2012-02
影响因子：
3.7
通讯作者：
E. Standard;T. Stanislavchuk;A. Sirenko;N. Lee;S. Cheong
中科院分区：
文献类型：
--
作者：
E. Standard;T. Stanislavchuk;A. Sirenko;N. Lee;S. Cheong
本文研究了六方REMnO_3（RE = Er，Tm，Yb，Lu）单晶的反铁磁共振（或称磁振子）和晶场跃迁的远红外光学透射谱。在1.5 K ~ 100 K温度范围内，用高达9 T的外磁场测量了磁振子和CF频率、振子强度和有效g因子。磁振子频率随稀土离子半径的减小而系统地增加。在低温T<3.5K和强外磁场下观察到稀土离子（RE=Er，Tm，Yb）的磁有序。考虑到系统中的主要磁相互作用，包括交换的Mn 3+自旋与RE 3+的顺磁矩所观察到的效果进行了分析。
Far-infrared optical transmission spectra of the antiferromagnetic resonances, or magnons, and crystal field transitions have been studied in hexagonal REMnO3 (RE = Er, Tm, Yb, Lu) single crystals. The magnon and CF frequencies, their oscillator strengths, and effective g-factors have been measured using external magnetic fields up to 9 T in the temperature range between 1.5 K and 100 K. The magnon frequency increases systematically with a decrease of the RE ion radius. The magnetic ordering of RE ions (RE=Er, Tm, Yb) was observed at low temperatures T<3.5 K and in strong external magnetic fields. The observed effects are analyzed taking into account main magnetic interactions in the system including exchange of the Mn3+ spins with RE3+ paramagnetic moments.