Anomalous boron isotope effects on electronic structure and lattice dynamics of CuB2O4
學年 109
學期 1
出版（發表）日期 2020-11-17
作品名稱 Anomalous boron isotope effects on electronic structure and lattice dynamics of 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 RSC Advances 10, p.41891-41900
摘要 Copper metaborate had a unique crystal structure and exhibited noteworthy magnetic phase transitions at 21 and 10 K. The electronic structure and lattice dynamics of copper metaborate Cu11B2O4 single crystals were investigated and compared with the optical properties of CuB2O4, to assess the boron isotope effect. The optical absorption spectrum at room temperature revealed two charge-transfer bands at approximately 4.30 and 5.21 eV with an extrapolated direct optical band gap of 3.16 ± 0.07 eV. Compared with the data on CuB2O4, the electronic transitions were shifted to lower energies upon the replacement of a heavier boron isotope. The band gap was also determined to be lower in Cu11B2O4. Anomalies in the temperature dependence of the optical band gap were observed below 21 K. Furthermore, 38 Raman-active phonon modes were identified in the room-temperature Raman scattering spectrum of Cu11B2O4, which were also observed in CuB2O4 with a shift to lower frequencies. No broadening caused by isotopic changes was observed. As the temperature decreased, phonon frequencies shifted to higher wavenumbers and the linewidth decreased. Anomalous softening in the Raman peaks below 21 K was also revealed.
關鍵字
語言 en_US
ISSN 2046-2069
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 GBR
公開徵稿
出版型式 ,電子版
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