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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.26426 |
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| _version_ | 1866918523397210112 |
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| author | Hao, Zhanyang Sheng, Haohao Ma, Wanru Zheng, Wengen Cai, Yongqing Xie, Zijuan Cheng, Wanlin Liang, Zuowei Xie, Wu Zhao, Wenjuan Liu, Chen Su, Zhibin Lin, Junhao Wu, Liusuo Liu, Zhengtai Ye, Mao Dai, Ji Tallarida, Massimo Cui, Shengtao Kumar, Yogendra Shimada, Kenya Ozawa, Kenichi Torii, Shuki Mori, Kazuhiro Xie, Yue Deng, Junze Wang, Jiaou Zhu, Xuetao Guo, Jiandong Mei, Jiawei Wang, Zhenyu Chen, Xianhui Miao, Ping Wang, Zhijun Chen, Chaoyu |
| author_facet | Hao, Zhanyang Sheng, Haohao Ma, Wanru Zheng, Wengen Cai, Yongqing Xie, Zijuan Cheng, Wanlin Liang, Zuowei Xie, Wu Zhao, Wenjuan Liu, Chen Su, Zhibin Lin, Junhao Wu, Liusuo Liu, Zhengtai Ye, Mao Dai, Ji Tallarida, Massimo Cui, Shengtao Kumar, Yogendra Shimada, Kenya Ozawa, Kenichi Torii, Shuki Mori, Kazuhiro Xie, Yue Deng, Junze Wang, Jiaou Zhu, Xuetao Guo, Jiandong Mei, Jiawei Wang, Zhenyu Chen, Xianhui Miao, Ping Wang, Zhijun Chen, Chaoyu |
| contents | Orbital order describes a quantum state where occupied orbitals line up in a periodic pattern. While orbital physics plays a fundamental and universal role in strongly correlated electron systems, the existence and particularly the band structure fingerprint of orbital order remain a long-standing mystery. Here, we report the discovery of rare earth 5d-orbital order developed by the surface states of intermetallic compound Tb2CoAl4Ge2. Angle-resolved photoemission spectroscopy reveals characteristic nematic features like Fermi surface deformation and band split. These experimental observations can be described by a ferro-orbital order term in the mean-field Hamiltonian. The structural and magnetic origin of such order is excluded by systematic high-resolution neutron powder diffraction and scanning tunnelling microscopy measurements. Our results provide strong evidence for a pure surface orbital order scenario avoiding complications from structural distortion as in colossal magnetoresistance manganites, magnetic order as in iron-based superconductors, and charge transfer p-orbital order in cuprates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_26426 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Surface d-orbital order in intermetallic compound Hao, Zhanyang Sheng, Haohao Ma, Wanru Zheng, Wengen Cai, Yongqing Xie, Zijuan Cheng, Wanlin Liang, Zuowei Xie, Wu Zhao, Wenjuan Liu, Chen Su, Zhibin Lin, Junhao Wu, Liusuo Liu, Zhengtai Ye, Mao Dai, Ji Tallarida, Massimo Cui, Shengtao Kumar, Yogendra Shimada, Kenya Ozawa, Kenichi Torii, Shuki Mori, Kazuhiro Xie, Yue Deng, Junze Wang, Jiaou Zhu, Xuetao Guo, Jiandong Mei, Jiawei Wang, Zhenyu Chen, Xianhui Miao, Ping Wang, Zhijun Chen, Chaoyu Strongly Correlated Electrons Orbital order describes a quantum state where occupied orbitals line up in a periodic pattern. While orbital physics plays a fundamental and universal role in strongly correlated electron systems, the existence and particularly the band structure fingerprint of orbital order remain a long-standing mystery. Here, we report the discovery of rare earth 5d-orbital order developed by the surface states of intermetallic compound Tb2CoAl4Ge2. Angle-resolved photoemission spectroscopy reveals characteristic nematic features like Fermi surface deformation and band split. These experimental observations can be described by a ferro-orbital order term in the mean-field Hamiltonian. The structural and magnetic origin of such order is excluded by systematic high-resolution neutron powder diffraction and scanning tunnelling microscopy measurements. Our results provide strong evidence for a pure surface orbital order scenario avoiding complications from structural distortion as in colossal magnetoresistance manganites, magnetic order as in iron-based superconductors, and charge transfer p-orbital order in cuprates. |
| title | Surface d-orbital order in intermetallic compound |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.26426 |