Scholarlink

<p>Orbital order describes a quantum state where occupied orbitals line up in a periodic pattern. Although 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 5<i>d-</i>orbital order developed by the surface states of the intermetallic compound Tb<sub>2</sub>CoAl<sub>4</sub>Ge<sub>2</sub>. Angle-resolved photoemission spectroscopy reveals characteristic nematic features such as Fermi surface deformation and band splitting. 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 <i>p-</i>orbital order in cuprates.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Surface d-orbital order in an intermetallic compound

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年6月29日

查看全文
  • Zhanyang Hao,
  • Haohao Sheng,
  • Wanru Ma,
  • Wengen Zheng,
  • Yongqing Cai,
  • Zijuan Xie,
  • Wanlin Cheng,
  • Zuowei Liang,
  • Wu Xie,
  • Wenjuan Zhao,
  • Chen Liu,
  • Zhibin Su,
  • Junhao Lin,
  • Liusuo Wu,
  • Zhengtai Liu,
  • Mao Ye,
  • Ji Dai,
  • Massimo Tallarida,
  • Shengtao Cui,
  • Yogendra Kumar,
  • Kenya Shimada,
  • Kenichi Ozawa,
  • Shuki Torii,
  • Kazuhiro Mori,
  • Yue Xie,
  • Junze Deng,
  • Jiaou Wang,
  • Xuetao Zhu,
  • Jiandong Guo,
  • Jiawei Mei,
  • Zhenyu Wang,
  • Xianhui Chen,
  • Ping Miao,
  • Zhijun Wang,
  • Chaoyu Chen

摘要

Orbital order describes a quantum state where occupied orbitals line up in a periodic pattern. Although 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 the intermetallic compound Tb2CoAl4Ge2. Angle-resolved photoemission spectroscopy reveals characteristic nematic features such as Fermi surface deformation and band splitting. 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.