Role of Vanadium-Oxide Layer in Electronic State of Sr$_2$VFeAsO$_{3-δ}$ with Oxygen Deficiency
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866929338373373952 |
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| author | Nakajima, Masamichi Yokota, Hiroaki Wakimura, Taihei Takeuchi, Tetsuya Nakamura, Koya Yashima, Mitsuharu Mukuda, Hidekazu Miyasaka, Shigeki Tajima, Setsuko |
| author_facet | Nakajima, Masamichi Yokota, Hiroaki Wakimura, Taihei Takeuchi, Tetsuya Nakamura, Koya Yashima, Mitsuharu Mukuda, Hidekazu Miyasaka, Shigeki Tajima, Setsuko |
| contents | Iron-based superconductor Sr$_2$VFeAsO$_3$ is composed of alternate stacking of a superconducting FeAs layer and an insulating vanadium-oxide layer with a perovskite-type structure. Electronic orders stemming from the spin and orbital degrees of freedom of V $3d$ electrons can arise in the vanadium-oxide layer, but such orders have not been confirmed so far. Here, we systematically investigate the electronic state of Sr$_2$VFeAsO$_{3-δ}$ with oxygen deficiency and demonstrate the phase diagram of Sr$_2$VFeAsO$_{3-δ}$ as a function of the $c$-axis lattice parameter, which has turned out to be a suitable measure of the amount of oxygen deficiency. We found a magnetic and structural anomaly at $\sim 100$ K with a thermal hysteresis, which is manifested with the introduction of oxygen deficiency. The presence of orthorhombic distortion was revealed below the temperature at which the anomaly appears, suggestive of V orbital ordering involving the $d_{xz}$ and $d_{yz}$ orbitals. It seems that substantial fluctuations associated with the orthorhombic distortion significantly influence the electronic state of the FeAs layer. Our findings indicate that the vanadium-oxide layer plays a significant role in the electronic state of Sr$_2$VFeAsO$_{3-δ}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_05893 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Role of Vanadium-Oxide Layer in Electronic State of Sr$_2$VFeAsO$_{3-δ}$ with Oxygen Deficiency Nakajima, Masamichi Yokota, Hiroaki Wakimura, Taihei Takeuchi, Tetsuya Nakamura, Koya Yashima, Mitsuharu Mukuda, Hidekazu Miyasaka, Shigeki Tajima, Setsuko Superconductivity Strongly Correlated Electrons Iron-based superconductor Sr$_2$VFeAsO$_3$ is composed of alternate stacking of a superconducting FeAs layer and an insulating vanadium-oxide layer with a perovskite-type structure. Electronic orders stemming from the spin and orbital degrees of freedom of V $3d$ electrons can arise in the vanadium-oxide layer, but such orders have not been confirmed so far. Here, we systematically investigate the electronic state of Sr$_2$VFeAsO$_{3-δ}$ with oxygen deficiency and demonstrate the phase diagram of Sr$_2$VFeAsO$_{3-δ}$ as a function of the $c$-axis lattice parameter, which has turned out to be a suitable measure of the amount of oxygen deficiency. We found a magnetic and structural anomaly at $\sim 100$ K with a thermal hysteresis, which is manifested with the introduction of oxygen deficiency. The presence of orthorhombic distortion was revealed below the temperature at which the anomaly appears, suggestive of V orbital ordering involving the $d_{xz}$ and $d_{yz}$ orbitals. It seems that substantial fluctuations associated with the orthorhombic distortion significantly influence the electronic state of the FeAs layer. Our findings indicate that the vanadium-oxide layer plays a significant role in the electronic state of Sr$_2$VFeAsO$_{3-δ}$. |
| title | Role of Vanadium-Oxide Layer in Electronic State of Sr$_2$VFeAsO$_{3-δ}$ with Oxygen Deficiency |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2405.05893 |