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<p>The three-dimensional pyrochlore lattice of corner-sharing tetrahedra can host a quantum spin ice, a quantum analogue of the classical spin ice found in other pyrochlore compounds. This state can manifest a quantum spin liquid, and indeed, these compounds are predicted to have emergent gauge fields that produce linearly dispersing collective magnetic excitations near zero energy, in addition to the presence of higher-energy spinon excitations. Here we use polarized neutron scattering experiments on single crystals of the Ce<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> pyrochlore. We find evidence for magnetic excitations near zero energy, in addition to signatures of spinons at higher energies. Furthermore, we perform heat capacity measurements and find behaviour consistent with the cubic-in-temperature dependence expected for linearly dispersing gapless bosonic modes. Comparing the observed magnetic excitations with theoretical calculations, we argue that Ce<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> is a strong candidate for a dipolar–octupolar quantum spin ice with dominant dipolar Ising interactions.</p>

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Neutron scattering and thermodynamic evidence for emergent photons and fractionalization in a pyrochlore spin ice

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Bin Gao,
  • Félix Desrochers,
  • David W. Tam,
  • Diana M. Kirschbaum,
  • Paul Steffens,
  • Arno Hiess,
  • Duy Ha Nguyen,
  • Yixi Su,
  • Sang-Wook Cheong,
  • Silke Paschen,
  • Yong Baek Kim,
  • Pengcheng Dai

摘要

The three-dimensional pyrochlore lattice of corner-sharing tetrahedra can host a quantum spin ice, a quantum analogue of the classical spin ice found in other pyrochlore compounds. This state can manifest a quantum spin liquid, and indeed, these compounds are predicted to have emergent gauge fields that produce linearly dispersing collective magnetic excitations near zero energy, in addition to the presence of higher-energy spinon excitations. Here we use polarized neutron scattering experiments on single crystals of the Ce2Zr2O7 pyrochlore. We find evidence for magnetic excitations near zero energy, in addition to signatures of spinons at higher energies. Furthermore, we perform heat capacity measurements and find behaviour consistent with the cubic-in-temperature dependence expected for linearly dispersing gapless bosonic modes. Comparing the observed magnetic excitations with theoretical calculations, we argue that Ce2Zr2O7 is a strong candidate for a dipolar–octupolar quantum spin ice with dominant dipolar Ising interactions.