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Quantum spin nematic phase in a square-lattice iridate.

التفاصيل البيبلوغرافية
العنوان: Quantum spin nematic phase in a square-lattice iridate.
المؤلفون: Kim H; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, South Korea.; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea., Kim JK; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, South Korea.; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea., Kwon J; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea., Kim J; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, South Korea.; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea., Kim HJ; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, South Korea.; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea., Ha S; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, South Korea.; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea., Kim K; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, South Korea.; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea., Lee W; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, South Korea.; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea., Kim J; Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea.; Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea., Cho GY; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, South Korea.; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea., Heo H; Department of Physics and Astronomy, Seoul National University, Seoul, South Korea., Jang J; Department of Physics and Astronomy, Seoul National University, Seoul, South Korea., Sahle CJ; ESRF, The European Synchrotron, Grenoble, France., Longo A; ESRF, The European Synchrotron, Grenoble, France.; Istituto per lo Studio dei Materiali Nanostrutturati (ISMN)-CNR, UOS Palermo, Palermo, Italy., Strempfer J; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA., Fabbris G; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA., Choi Y; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA., Haskel D; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA., Kim J; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA., Kim J-; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA., Kim BJ; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, South Korea. bjkim6@postech.ac.kr.; Department of Physics, Pohang University of Science and Technology, Pohang, South Korea. bjkim6@postech.ac.kr.
المصدر: Nature [Nature] 2024 Jan; Vol. 625 (7994), pp. 264-269. Date of Electronic Publication: 2023 Dec 13.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Nature Publishing Group Country of Publication: England NLM ID: 0410462 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1476-4687 (Electronic) Linking ISSN: 00280836 NLM ISO Abbreviation: Nature Subsets: MEDLINE
أسماء مطبوعة: Publication: Basingstoke : Nature Publishing Group
Original Publication: London, Macmillan Journals ltd.
مواضيع طبية MeSH: Cold Temperature* , Liquid Crystals*, Phase Transition ; Superconductivity ; X-Ray Diffraction
مستخلص: Spin 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 Sr 2 IrO 4 , 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.)
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تواريخ الأحداث: Date Created: 20231213 Date Completed: 20240112 Latest Revision: 20240112
رمز التحديث: 20240112
DOI: 10.1038/s41586-023-06829-4
PMID: 38093009
قاعدة البيانات: MEDLINE
الوصف
تدمد:1476-4687
DOI:10.1038/s41586-023-06829-4