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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.11649 |
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| _version_ | 1866917899029970944 |
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| author | Chen, Jian Song, Guozhu Ge, Han Santos, Antonio M. Dos Wu, Liusuo Zhao, Yusheng Wang, Shanmin |
| author_facet | Chen, Jian Song, Guozhu Ge, Han Santos, Antonio M. Dos Wu, Liusuo Zhao, Yusheng Wang, Shanmin |
| contents | As a recently-identified Mott system, PbCrO3 remains largely unexplored, especially for its band structure, leading to many contentious issues on its structural, electronic, and magnetic properties. Here we present a comprehensive study of two different Pb1-δCrO3 (δ = 0 and 0.15) samples with involving atomic deficiency prepared under pressure. By means of the state-of-the-art diffraction techniques, crystal structure of PbCrO3 is definitively determined to adopt the pristine Pm-3m symmetry, rather than other previously misassigned structures of M2-Pm-3m and Pmnm. The two materials exhibit a similar charge-transfer-type insulating band structure, and the charge-transfer effect splits both Cr2p and Pb4f orbitals, rationalizing doublet splitting of the associated spectral lines. Nearly identical nominal cationic valence states of Cr4+ and Pb2+ are identified for this oxide system, hence calling into question the validity of recently-proposed charge disproportionation mechanisms. Besides, Pb0.85CrO3 exhibits an anomalously higher Néel temperature of ~240 K than that of PbCrO3 (i.e., ~200 K), likely due to the deficiency-induced enhancements of Cr: 3d-O:2p orbital overlap and magnetic exchange. These findings provide many solid evidences to look into the fundamental properties of this important material system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_11649 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Unraveling structural, electronic, and magnetic ambiguities in Pb1-δCrO3 with an insulating charge-transfer band structure Chen, Jian Song, Guozhu Ge, Han Santos, Antonio M. Dos Wu, Liusuo Zhao, Yusheng Wang, Shanmin Materials Science As a recently-identified Mott system, PbCrO3 remains largely unexplored, especially for its band structure, leading to many contentious issues on its structural, electronic, and magnetic properties. Here we present a comprehensive study of two different Pb1-δCrO3 (δ = 0 and 0.15) samples with involving atomic deficiency prepared under pressure. By means of the state-of-the-art diffraction techniques, crystal structure of PbCrO3 is definitively determined to adopt the pristine Pm-3m symmetry, rather than other previously misassigned structures of M2-Pm-3m and Pmnm. The two materials exhibit a similar charge-transfer-type insulating band structure, and the charge-transfer effect splits both Cr2p and Pb4f orbitals, rationalizing doublet splitting of the associated spectral lines. Nearly identical nominal cationic valence states of Cr4+ and Pb2+ are identified for this oxide system, hence calling into question the validity of recently-proposed charge disproportionation mechanisms. Besides, Pb0.85CrO3 exhibits an anomalously higher Néel temperature of ~240 K than that of PbCrO3 (i.e., ~200 K), likely due to the deficiency-induced enhancements of Cr: 3d-O:2p orbital overlap and magnetic exchange. These findings provide many solid evidences to look into the fundamental properties of this important material system. |
| title | Unraveling structural, electronic, and magnetic ambiguities in Pb1-δCrO3 with an insulating charge-transfer band structure |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.11649 |