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Quadrupolar magnetic excitations in an isotropic spin-1 antiferromagnet

Author

Listed:
  • A. Nag

    (Diamond Light Source
    SwissFEL, Paul Scherrer Institut)

  • A. Nocera

    (University of British Columbia
    University of British Columbia)

  • S. Agrestini

    (Diamond Light Source)

  • M. Garcia-Fernandez

    (Diamond Light Source)

  • A. C. Walters

    (Diamond Light Source)

  • Sang-Wook Cheong

    (Rutgers University)

  • S. Johnston

    (The University of Tennessee
    University of Tennessee)

  • Ke-Jin Zhou

    (Diamond Light Source)

Abstract

The microscopic origins of emergent behaviours in condensed matter systems are encoded in their excitations. In ordinary magnetic materials, single spin-flips give rise to collective dipolar magnetic excitations called magnons. Likewise, multiple spin-flips can give rise to multipolar magnetic excitations in magnetic materials with spin S ≥ 1. Unfortunately, since most experimental probes are governed by dipolar selection rules, collective multipolar excitations have generally remained elusive. For instance, only dipolar magnetic excitations have been observed in isotropic S = 1 Haldane spin systems. Here, we unveil a hidden quadrupolar constituent of the spin dynamics in antiferromagnetic S = 1 Haldane chain material Y2BaNiO5 using Ni L3-edge resonant inelastic x-ray scattering. Our results demonstrate that pure quadrupolar magnetic excitations can be probed without direct interactions with dipolar excitations or anisotropic perturbations. Originating from on-site double spin-flip processes, the quadrupolar magnetic excitations in Y2BaNiO5 show a remarkable dual nature of collective dispersion. While one component propagates as non-interacting entities, the other behaves as a bound quadrupolar magnetic wave. This result highlights the rich and largely unexplored physics of higher-order magnetic excitations.

Suggested Citation

  • A. Nag & A. Nocera & S. Agrestini & M. Garcia-Fernandez & A. C. Walters & Sang-Wook Cheong & S. Johnston & Ke-Jin Zhou, 2022. "Quadrupolar magnetic excitations in an isotropic spin-1 antiferromagnet," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30065-5
    DOI: 10.1038/s41467-022-30065-5
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    References listed on IDEAS

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    1. Adarsh S. Patri & Akito Sakai & SungBin Lee & Arun Paramekanti & Satoru Nakatsuji & Yong Baek Kim, 2019. "Unveiling hidden multipolar orders with magnetostriction," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    2. Matthew B. Stone & Igor A. Zaliznyak & Tao Hong & Collin L. Broholm & Daniel H. Reich, 2006. "Quasiparticle breakdown in a quantum spin liquid," Nature, Nature, vol. 440(7081), pages 187-190, March.
    3. Sougato Bose, 2013. "Quantum togetherness," Nature, Nature, vol. 502(7469), pages 40-41, October.
    4. J. Schlappa & U. Kumar & K. J. Zhou & S. Singh & M. Mourigal & V. N. Strocov & A. Revcolevschi & L. Patthey & H. M. Rønnow & S. Johnston & T. Schmitt, 2018. "Probing multi-spinon excitations outside of the two-spinon continuum in the antiferromagnetic spin chain cuprate Sr2CuO3," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
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    Cited by:

    1. A. Jażdżewska & M. Mierzejewski & M. Środa & A. Nocera & G. Alvarez & E. Dagotto & J. Herbrych, 2023. "Transition to the Haldane phase driven by electron-electron correlations," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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