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Ce2Zr2O7 and CeMgAl11O19 are two exemplary materials that highlight the rich physics of quantum spin liquids and frustrated magnetism. Ce2Zr2O7, a pyrochlore lattice compound, is a leading candidate for quantum spin ice. Previous unpolarized neutron scattering experiments have revealed spinon excitations [1], while our recent polarized neutron scattering reveals the long-predicted “photon” excitation for the first time [2], characteristic of quantum spin ice.
In contrast, CeMgAl11O19 offers a novel realization of a spin liquid on a triangular lattice. It features a continuum of spin excitations arising from the ground-state degeneracy of the XXZ model near its exactly solvable point, where the ground state is degenerate umbrella state configurations [3].
Reference:
[1] B. Gao et al., Experimental signatures of a three-dimensional quantum spin liquid in effective spin-1/2 Ce2Zr2O7 pyrochlore, Nat Phys 15, 1052 (2019).
[2] B. Gao et al., Emergent photons and fractionalized excitations in a quantum spin liquid, ArXiv: 2404.04207 (2024).
[3] B. Gao et al., Spin Excitation Continuum in the Exactly Solvable Triangular-Lattice Spin Liquid CeMgAl11O19, ArXiv2408.15957 (2024).
Bin Gao is a Research Scientist at Rice University, working with Prof. Pengcheng Dai. He earned his Ph.D. in 2017 from Rutgers University under the supervision of Prof. Sang-Wook Cheong, specializing in multiferroic materials and establishing himself as a leading expert in single-crystal growth. His current research focuses on neutron scattering studies of quantum spin liquids and other exotic magnetic materials. He has published in the Nature series and Physical Review series, with 60 publications, citations of ~ 2,800, and an h-index of 26.
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