Spectroscopic signature of spinchargelattice coupling in CuB2O2

Rea Divina Mero, Chun Hao Lai, Chao Hung Du, Hsiang Lin Liu*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

3 引文 斯高帕斯(Scopus)

摘要

CuB2O2has attracted considerable attention because of its unique chemical and physical properties and potential practical applications. In this paper, we investigated the optical properties of CuB2O2single crystals through spectroscopic ellipsometry and Raman scattering spectroscopy. The optical absorption spectrum at room temperature revealed a direct band gap at approximately 3.88 0.01 eV and two bands near 4.49 and 5.90 eV. The observed bands were related to charge transfer of electrons from the 2p states of the oxygen ions to the 3d states of the copper ions. The band gap exhibited unusual redshift with a decrease in temperature. Upon cooling across 21 K, which is the canted antiferromagnetic ordering temperature, the band gap, peak energy, and normalized intensity of charge-Transfer bands presented anomalies. Furthermore, 38 phonon modes were identified in the room-Temperature Raman scattering spectrum of CuB2O2. The phonon modes at approximately 335, 393, 403, 445, 473, 598, 706, 787, and 900 cm1 exhibited softening below 21 K. The spinphonon coupling constants were estimated to be 0.020.03 cm1. These findings highlight a complex nature of spin chargelattice interactions in CuB2O2

原文英語
頁(從 - 到)4322-4329
頁數8
期刊Journal of Physical Chemistry C
125
發行號7
DOIs
出版狀態已發佈 - 2021 二月 25

ASJC Scopus subject areas

  • 電子、光磁材料
  • 能源(全部)
  • 物理與理論化學
  • 表面、塗料和薄膜

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