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Quantum spin nematic phase in a square-lattice iridate

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dc.contributor.authorHoon Kim-
dc.contributor.authorJin-Kwang Kim-
dc.contributor.authorKwon, Junyoung-
dc.contributor.authorJimin Kim-
dc.contributor.authorHyun-Woo J. Kim-
dc.contributor.authorSeunghyeok Ha-
dc.contributor.authorKwangrae Kim-
dc.contributor.authorWonjun Lee-
dc.contributor.authorJonghwan Kim-
dc.contributor.authorGil Young Cho-
dc.contributor.authorHeo, Hyeokjun-
dc.contributor.authorJang, Joonho-
dc.contributor.authorSahle, C.J.-
dc.contributor.authorLongo, A.-
dc.contributor.authorStrempfer, J.-
dc.contributor.authorFabbris, G.-
dc.contributor.authorChoi, Y.-
dc.contributor.authorHaskel, D.-
dc.contributor.authorKim, Jungho-
dc.contributor.authorKim, J.-W.-
dc.contributor.authorBumjoon Kim-
dc.date.accessioned2024-02-06T22:00:28Z-
dc.date.available2024-02-06T22:00:28Z-
dc.date.created2023-12-18-
dc.date.issued2024-01-
dc.identifier.issn0028-0836-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/14777-
dc.description.abstractSpin nematic is a magnetic analogue of classical liquid crystals, a fourth state of matter exhibiting characteristics of both liquid and solid 1,2. Particularly intriguing is a valence-bond spin nematic 3–5, in which spins are quantum entangled to form a multipolar order without breaking time-reversal symmetry, but its unambiguous experimental realization remains elusive. Here we establish a spin nematic phase in the square-lattice iridate Sr2IrO4, which approximately realizes a pseudospin one-half Heisenberg antiferromagnet in the strong spin–orbit coupling limit 6–9. Upon cooling, the transition into the spin nematic phase at T C ≈ 263 K is marked by a divergence in the static spin quadrupole susceptibility extracted from our Raman spectra and concomitant emergence of a collective mode associated with the spontaneous breaking of rotational symmetries. The quadrupolar order persists in the antiferromagnetic phase below T N ≈ 230 K and becomes directly observable through its interference with the antiferromagnetic order in resonant X-ray diffraction, which allows us to uniquely determine its spatial structure. Further, we find using resonant inelastic X-ray scattering a complete breakdown of coherent magnon excitations at short-wavelength scales, suggesting a many-body quantum entanglement in the antiferromagnetic state 10,11. Taken together, our results reveal a quantum order underlying the Néel antiferromagnet that is widely believed to be intimately connected to the mechanism of high-temperature superconductivity 12,13. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.-
dc.language영어-
dc.publisherNature Publishing Group-
dc.titleQuantum spin nematic phase in a square-lattice iridate-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.wosid001143579000012-
dc.identifier.scopusid2-s2.0-85179325155-
dc.identifier.rimsid82195-
dc.contributor.affiliatedAuthorHoon Kim-
dc.contributor.affiliatedAuthorJin-Kwang Kim-
dc.contributor.affiliatedAuthorJimin Kim-
dc.contributor.affiliatedAuthorHyun-Woo J. Kim-
dc.contributor.affiliatedAuthorSeunghyeok Ha-
dc.contributor.affiliatedAuthorKwangrae Kim-
dc.contributor.affiliatedAuthorWonjun Lee-
dc.contributor.affiliatedAuthorJonghwan Kim-
dc.contributor.affiliatedAuthorGil Young Cho-
dc.contributor.affiliatedAuthorBumjoon Kim-
dc.identifier.doi10.1038/s41586-023-06829-4-
dc.identifier.bibliographicCitationNature, v.625, no.7994, pp.264 - 269-
dc.relation.isPartOfNature-
dc.citation.titleNature-
dc.citation.volume625-
dc.citation.number7994-
dc.citation.startPage264-
dc.citation.endPage269-
dc.description.journalClass1-
dc.description.journalClass1-
dc.description.isOpenAccessN-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
Center for Van der Waals Quantum Solids(반데르발스 양자 물질 연구단) > 1. Journal Papers (저널논문)
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