Related Scientist

caldes's photo.

more info


Quantum spin nematic phase in a square-lattice iridate

Cited 0 time in webofscience Cited 0 time in scopus
98 Viewed 0 Downloaded
Quantum spin nematic phase in a square-lattice iridate
Hoon Kim; Jin-Kwang Kim; Kwon, Junyoung; Jimin Kim; Hyun-Woo J. Kim; Seunghyeok Ha; Kwangrae Kim; Wonjun Lee; Jonghwan Kim; Gil Young Cho; Heo, Hyeokjun; Jang, Joonho; Sahle, C.J.; Longo, A.; Strempfer, J.; Fabbris, G.; Choi, Y.; Haskel, D.; Kim, Jungho; Kim, J.-W.; Bumjoon Kim
Publication Date
Nature, v.625, no.7994, pp.264 - 269
Nature Publishing Group
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 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.
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)
Files in This Item:
There are no files associated with this item.


  • facebook


  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.