Spectroscopic investigation on the electronic structure of a 5d band insulator SrHfO3 in proximity to ferroelectric instability: Comparison with SrTiO3 and SrZrO3 |
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| Authors: | D.J. Lee Y.K. Seo Y.S. Lee H.-J. Noh |
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| Affiliation: | 1. Department of Physics, Soongsil University, Seoul 156–743, Republic of Korea;2. Department of Physics, Chonnam National University, Gwangju 500–757, Republic of Korea;1. Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea;2. Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea;3. Hanbeam Corporation Ltd, Iui-dong 906-5, Yeongtong-gu, Suwon-si, Gyeonggi-do, South Korea;1. Department of Physics, Soongsil University, Seoul 156-743, South Korea;2. Department of Physics, Chonbuk National University, Jeonju 561-756, South Korea;1. Department of Physics, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran;2. Department of Physics, Iran University of Science and Technology, Tehran, Iran;3. Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran;4. Computational Materials Science Laboratory, Nano Research and Training Center, NRTC, Iran |
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| Abstract: | We investigated the high-energy electronic structure of a 5d perovskite SrHfO3 by using optical spectroscopy and O 1s x-ray absorption spectroscopy. From the combined spectra the values of electronic structure parameters are estimated properly. In particular, the crystal field splitting energy, which is closely associated with the p–d hybridization strength, is as high as ～5 eV, and the Sr 4d bands appear to be strongly mixed with the Hf 5d bands. These findings are discussed in relation to a possible ferroelectric instability in SrHfO3, and are compared with electronic properties of similar compounds, 3d SrTiO3 and 4d SrZrO3. |
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