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<p>The quantum-disordered state in FeSe, intertwined with superconductivity and nematicity, has been a research focus in iron-based superconductors. However, the intrinsic spin excitations across the entire Brillouin zone in detwinned FeSe, crucial for understanding its magnetism and superconductivity, have remained unresolved. Using inelastic neutron scattering, we reveal that stripe spin excitations (<b>Q</b> = (1, 0)/(0, 1)) exhibit the <i>C</i><sub>2</sub> symmetry, while Néel spin excitations (<b>Q</b> = (1, 1)) retain <i>C</i><sub>4</sub> symmetry within the nematic state. Temperature-dependent differences between <b>Q</b> = (1, 0) and (0, 1) spin excitations above the structural transition unambiguously reveals the nematic quantum disordered state. Comparison with NaFeAs suggests the Néel excitations originate from enhanced 3<i>d</i><sub><i>x</i><i>y</i></sub> orbital correlations. Modeling the stripe dispersions using a <i>J</i><sub>1</sub>-<i>K</i>-<i>J</i><sub>2</sub> Heisenberg Hamiltonian, we establish a spin-interaction phase diagram, positioning FeSe near a crossover regime between the antiferroquadrupolar, Néel, and stripe orders. Our results provide key insights into the microscopic spin interactions and their role in the intertwined orders in iron-based superconductors.</p>

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Spin correlations in the nematic quantum disordered state of FeSe

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月5日

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  • Ruixian Liu,
  • Matthew B. Stone,
  • Shang Gao,
  • Mitsutaka Nakamura,
  • Kazuya Kamazawa,
  • Aleksandra Krajewska,
  • Helen C. Walker,
  • Peng Cheng,
  • Rong Yu,
  • Qimiao Si,
  • Pengcheng Dai,
  • Xingye Lu

摘要

The quantum-disordered state in FeSe, intertwined with superconductivity and nematicity, has been a research focus in iron-based superconductors. However, the intrinsic spin excitations across the entire Brillouin zone in detwinned FeSe, crucial for understanding its magnetism and superconductivity, have remained unresolved. Using inelastic neutron scattering, we reveal that stripe spin excitations (Q = (1, 0)/(0, 1)) exhibit the C2 symmetry, while Néel spin excitations (Q = (1, 1)) retain C4 symmetry within the nematic state. Temperature-dependent differences between Q = (1, 0) and (0, 1) spin excitations above the structural transition unambiguously reveals the nematic quantum disordered state. Comparison with NaFeAs suggests the Néel excitations originate from enhanced 3dxy orbital correlations. Modeling the stripe dispersions using a J1-K-J2 Heisenberg Hamiltonian, we establish a spin-interaction phase diagram, positioning FeSe near a crossover regime between the antiferroquadrupolar, Néel, and stripe orders. Our results provide key insights into the microscopic spin interactions and their role in the intertwined orders in iron-based superconductors.