Polar, checkerboard charge order in bilayer nickelate La3Ni2O7
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866918409795534848 |
|---|---|
| author | Misawa, Ryo Kitou, Shunsuke Sun, Jian-Ping Yu, Yingpeng Koyama, Chihaya Nakamura, Yuiga Arima, Taka-hisa Cheng, Jin-Guang Hirschberger, Max |
| author_facet | Misawa, Ryo Kitou, Shunsuke Sun, Jian-Ping Yu, Yingpeng Koyama, Chihaya Nakamura, Yuiga Arima, Taka-hisa Cheng, Jin-Guang Hirschberger, Max |
| contents | Competing charge and spin orders are central to uncovering the nature of unconventional superconductivity. Here we utilize synchrotron X-ray diffraction on a high-quality single crystal to reveal the charge order of La$_3$Ni$_2$O$_7$ at ambient pressure, which competes with the high-temperature superconducting phase under pressure. Enabled by the high synchrotron photon flux and a large dynamic range, we resolve faint reflections -- nearly four orders of magnitude weaker than the main Bragg reflections -- that were overlooked in prior diffraction studies. This observation evidences a broken glide-mirror symmetry, leading to a polar crystal structure, rather than the widely used centrosymmetric structure model. The polarity is induced by checkerboard charge order on nickel sites in combination with octahedral tilting, reminiscent of bilayer manganese oxides. Our results provide a foundation for understanding phase competition and the mechanism of pressure-induced superconductivity in bilayer nickelates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_25119 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Polar, checkerboard charge order in bilayer nickelate La3Ni2O7 Misawa, Ryo Kitou, Shunsuke Sun, Jian-Ping Yu, Yingpeng Koyama, Chihaya Nakamura, Yuiga Arima, Taka-hisa Cheng, Jin-Guang Hirschberger, Max Superconductivity Strongly Correlated Electrons Competing charge and spin orders are central to uncovering the nature of unconventional superconductivity. Here we utilize synchrotron X-ray diffraction on a high-quality single crystal to reveal the charge order of La$_3$Ni$_2$O$_7$ at ambient pressure, which competes with the high-temperature superconducting phase under pressure. Enabled by the high synchrotron photon flux and a large dynamic range, we resolve faint reflections -- nearly four orders of magnitude weaker than the main Bragg reflections -- that were overlooked in prior diffraction studies. This observation evidences a broken glide-mirror symmetry, leading to a polar crystal structure, rather than the widely used centrosymmetric structure model. The polarity is induced by checkerboard charge order on nickel sites in combination with octahedral tilting, reminiscent of bilayer manganese oxides. Our results provide a foundation for understanding phase competition and the mechanism of pressure-induced superconductivity in bilayer nickelates. |
| title | Polar, checkerboard charge order in bilayer nickelate La3Ni2O7 |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.25119 |