教師資料查詢 | 類別: 期刊論文 | 教師: 杜昭宏CHAO-HUNG DU (瀏覽個人網頁)

標題:Spectroscopic Signature of Spin-Charge-Lattice Coupling in CuB2O4
學年109
學期2
出版(發表)日期2021/02/16
作品名稱Spectroscopic Signature of Spin-Charge-Lattice Coupling in CuB2O4
作品名稱(其他語言)
著者Rea Divina Mero; Chun-Hao Lai; Chao-Hung Du; Hsiang-Lin Liu
單位
出版者
著錄名稱、卷期、頁數Journal of Physical Chemistry C 125(7), p.4322-4329
摘要CuB2O4 has attracted considerable attention because of its unique chemical and physical properties and potential practical applications. In this paper, we investigated the optical properties of CuB2O4 single 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 CuB2O4. The phonon modes at approximately 335, 393, 403, 445, 473, 598, 706, 787, and 900 cm–1 exhibited softening below 21 K. The spin–phonon coupling constants were estimated to be 0.02–0.03 cm–1. These findings highlight a complex nature of spin–charge–lattice interactions in CuB2O4.
關鍵字
語言英文(美國)
ISSN1932-7455
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式,電子版,紙本
相關連結
SDGs
  • 優質教育,產業創新與基礎設施
Google+ 推薦功能,讓全世界都能看到您的推薦!