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<p>The surfaces of strongly correlated materials can exhibit exotic properties that differ substantially from the bulk. Investigation of these surface effects requires both high quality surfaces, and an experimental technique capable of disentangling surface and underneath layers or bulk. Herein, we overcome these two challenges, using newly developed grazing-incident-angle resonant soft x-ray and magnetic scattering techniques to study ultrathin films of Spin(S) = 1/2 La<sub>2</sub>CuO<sub>4</sub>, the parent compound of high-critical-temperature (high-<i>T</i><sub>c</sub>) superconductor. We observe emergent surface magnetic ordering and surface-<i>like</i> electronic dipole layers at room temperature. As a function of temperature, intrinsic holes from Cu<sup>2+</sup> and O<sup>2-</sup> ions are mitigated from the surface into subsurface layers and back into the surface. The intrinsic hole and oxygen ion mitigation have different rates, yielding strong temperature hysteresis. Supported with theoretical calculations, these surface orderings consist of a mixture of Cu<sup>2+</sup> 3<i>d</i><sup>9</sup> (S = 1/2) and Cu<sup>1+</sup> 3<i>d</i><sup>10</sup>-<i>like</i> (S = 0) with strong magneto-electronic coupling through the many-body upper Hubbard band. Our results highlight intrinsic holes and oxygen ion mitigations, yielding surface-like electronic dipole and magnetic orderings and the potential of grazing-incident-angle resonant soft X-ray and magnetic scattering to elucidate, layer-by-layer, magnetic and electronic structures.”</p>

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Emergent surface magnetic ordering and surface electronic dipole layers in a two-dimensional spin=1/2 La2CuO4 film

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月31日

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  • Anjali Jain,
  • Caozheng Diao,
  • Bin Leong Ong,
  • Angga Dito Fauzi,
  • Kaushik Jayaraman,
  • Muhammad Avicenna Naradipa,
  • Sai Prashanth Josyula,
  • Xiao Chi,
  • Thomas James Whitcher,
  • Muhandis Shiddiq,
  • Mark B. H. Breese,
  • Eng Soon Tok,
  • Andrivo Rusydi

摘要

The surfaces of strongly correlated materials can exhibit exotic properties that differ substantially from the bulk. Investigation of these surface effects requires both high quality surfaces, and an experimental technique capable of disentangling surface and underneath layers or bulk. Herein, we overcome these two challenges, using newly developed grazing-incident-angle resonant soft x-ray and magnetic scattering techniques to study ultrathin films of Spin(S) = 1/2 La2CuO4, the parent compound of high-critical-temperature (high-Tc) superconductor. We observe emergent surface magnetic ordering and surface-like electronic dipole layers at room temperature. As a function of temperature, intrinsic holes from Cu2+ and O2- ions are mitigated from the surface into subsurface layers and back into the surface. The intrinsic hole and oxygen ion mitigation have different rates, yielding strong temperature hysteresis. Supported with theoretical calculations, these surface orderings consist of a mixture of Cu2+ 3d9 (S = 1/2) and Cu1+ 3d10-like (S = 0) with strong magneto-electronic coupling through the many-body upper Hubbard band. Our results highlight intrinsic holes and oxygen ion mitigations, yielding surface-like electronic dipole and magnetic orderings and the potential of grazing-incident-angle resonant soft X-ray and magnetic scattering to elucidate, layer-by-layer, magnetic and electronic structures.”