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. 2019 Mar 1;9:3223. doi: 10.1038/s41598-019-39031-6

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© The Author(s) 2019

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(a) Dielectric function for YBaCuFeO₅ at room temperature. (b) Optical absorption coefficient of YBaCuFeO₅ at room temperature. The dashed lines indicate the best fit from the Lorentzian model. The inset illustrates the direct band gap analysis of YBaCuFeO₅.