Spin-charge-lattice coupling in YBaCuFeO 5: Optical properties and first-principles calculations

H. W. Chen, Y. W. Chen, J. L. Kuo, Y. C. Lai, F. C. Chou, C. H. Du, H. L. Liu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We combined spectroscopic ellipsometry, Raman scattering spectroscopy, and first-principles calculations to explore the optical properties of YBaCuFeO 5 single crystals. Measuring the optical absorption spectrum of YBaCuFeO 5 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 E g phonon mode was observed at 175 K. The value of the spin–phonon coupling constant was 15.7 mRy/Å 2 . These results suggest a complex nature of spin–charge–lattice interactions in YBaCuFeO 5 .

Original languageEnglish
Article number3223
JournalScientific Reports
Volume9
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

ASJC Scopus subject areas

  • General

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