...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Lattice dynamics of piezoelectric copper metaborate CuB_2O_4
【24h】

Lattice dynamics of piezoelectric copper metaborate CuB_2O_4

机译：压电偏硼酸铜CuB_2O_4的晶格动力学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Tetragonal piezoelectric copper metaborate CuB_2O_4 (space group I42d, Z = 12) became a subject of active research during the last decade because it demonstrates unique magnetic, optical, and magnetooptical properties. We report results of the optical studies of polarized infrared reflection and transmission spectra and Raman back-scattering spectra in the range from 20 to 2500 cm~(-1). In accordance with the symmetry analysis, infrared studies allowed us to identify all polar B_2 (z),and E(x, y) normal vibrational modes. Frequencies of all longitudinal (LO) and transverse (TO) optical phonons were determined by fitting the observed infrared reflection spectra. Raman measurements revealed the frequencies of the majority of nonpolar A_1(xx,yy,zz) and B_1(xx,yy) modes and polar B_2(z) and E(x,y) LO modes. We show that several groups of closely spaced spectral lines observed in the vibrational spectra of CuB_2O_4 can be considered as a result of the Davydov splitting, which takes place in the case of several equivalent molecular units in a primitive crystal cell. Multiphonon absorption in the range of 1200-2500 cm~(-1) was analyzed and a tentative assignment of some features was given. Ab initio calculations of all zone-center polar and nonpolar modes were performed using density functional theory (DFT). The computed frequency distribution is in a good agreement with observed line positions in the infrared and Raman spectra. All these results allowed us to suggest reliable identification of all zone-center phonon modes thus providing a firm basis for further experimental and theoretical studies of this material with complex crystal, magnetic, and electronic structures and fascinating physical properties.
机译：在过去的十年中，四方压电偏硼酸铜CuB_2O_4（空间群I42d，Z = 12）成为积极研究的对象，因为它具有独特的磁，光和磁光特性。我们报道了在20到2500 cm〜（-1）范围内的偏振红外反射和透射光谱以及拉曼反向散射光谱的光学研究结果。根据对称性分析，红外研究使我们能够确定所有极性B_2（z）和E（x，y）正常振动模式。通过拟合观察到的红外反射光谱，确定所有纵向（LO）和横向（TO）光子的频率。拉曼测量揭示了大多数非极性A_1（xx，yy，zz）和B_1（xx，yy）模式以及极性B_2（z）和E（x，y）LO模式的频率。我们显示，在原始晶体晶胞中有几个等效分子单元的情况下，发生了达维多夫分裂，可以认为在CuB_2O_4振动光谱中观察到的几组紧密间隔的光谱线。分析了1200-2500 cm〜（-1）范围内的多声子吸收，并初步确定了一些特征。使用密度泛函理论（DFT）对所有区域中心的极性和非极性模式进行了从头计算。计算出的频率分布与红外和拉曼光谱中观察到的线位置非常吻合。所有这些结果使我们能够建议对所有区域中心声子模式进行可靠的鉴定，从而为对该材料具有复杂的晶体，磁性和电子结构以及令人着迷的物理性质的进一步实验和理论研究提供坚实的基础。

著录项

  • 来源
    《Physical review》 |2013年第2期|024301.1-024301.15|共15页
  • 作者

    R. V. Pisarev; K. N. Boldyrev; M. N. Popova; A. N. Smirnov; V. Yu. Davydov; L. N. Bezmatemykh; M. B. Smirnov; V. Yu. Kazimirov;

  • 作者单位

    Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;

    Institute of Spectroscopy, Russian Academy of Sciences, 142190 Moscow, Troitsk, Russia;

    Institute of Spectroscopy, Russian Academy of Sciences, 142190 Moscow, Troitsk, Russia;

    Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;

    Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;

    Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russia;

    Physics Department, St. Petersburg State University, 199034 St. Petersburg, Russia;

    Joint Institute for Nuclear Research, 141980 Dubna, Russia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    phonons in crystal lattices; infrared and raman spectra;

    机译：晶格中的声子;红外光谱和拉曼光谱;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号