Spin-charge-lattice coupling in YBaCuFeO5: Optical properties and first-principles calculations
學年 107
學期 2
出版（發表）日期 2019-03-01
作品名稱 Spin-charge-lattice coupling in YBaCuFeO5: Optical properties and first-principles calculations
作品名稱（其他語言）
著者 H. W. Chen; Y.-W. Chen; J.-L. Kuo; Y. C. Lai; F. C. Chou; C. H. Du; H. L. Liu
單位
出版者
著錄名稱、卷期、頁數 Scientific Report 9, p.3223
摘要 We combined spectroscopic ellipsometry, Raman scattering spectroscopy, and first-principles calculations to explore the optical properties of YBaCuFeO5 single crystals. Measuring the optical absorption spectrum of YBaCuFeO5 at room temperature revealed a direct optical band gap at approximately 1.41 eV and five bands near 1.69, 2.47, 3.16, 4.26, and 5.54 eV. Based on first-principles calculations, the observed optical excitations were appropriately assigned. Analysis of the temperature dependence of the band gap indicated anomalies in antiferromagnetic phase transition at 455 and 175 K. Additionally, a hardening in the frequency of the Eg phonon mode was observed at 175 K. The value of the spin–phonon coupling constant was 15.7 mRy/Å2. These results suggest a complex nature of spin–charge–lattice interactions in YBaCuFeO5.
關鍵字
語言 en
ISSN
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 否
國別 DEU
公開徵稿
出版型式 ,電子版,紙本
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