Spin correlations in the nematic quantum disordered state of FeSe

Ruixian Liu, Matthew B. Stone, Shang Gao, Mitsutaka Nakamura, Kazuya Kamazawa, Aleksandra Krajewska, Helen C. Walker, Peng Cheng, Rong Yu, Qimiao Si, Pengcheng Dai () and Xingye Lu ()
Additional contact information
Ruixian Liu: Beijing Normal University
Matthew B. Stone: Oak Ridge National Laboratory
Shang Gao: Oak Ridge National Laboratory
Mitsutaka Nakamura: Japan Atomic Energy Agency (JAEA), Tokai
Kazuya Kamazawa: Comprehensive Research Organization for Science and Society, Tokai
Aleksandra Krajewska: Rutherford Appleton Laboratory, STFC, Chilton
Helen C. Walker: Rutherford Appleton Laboratory, STFC, Chilton
Peng Cheng: Renmin University of China
Rong Yu: Renmin University of China
Qimiao Si: Rice University
Pengcheng Dai: Rice University
Xingye Lu: Beijing Normal University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract 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.

Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-025-60071-2 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-60071-2

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-025-60071-2

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().