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Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho3Mg2Sb3O14



Zhiling Dun, Xiaojian Bai, Jospeh A. Paddison, Emily Hollingworth, Nicholas Butch, Clarina D. Cruz, Matthew Stone, Tao Hong, Franz Demmel, Martin Mourigal, Haidong Zhou


A promising route to realize entangled magnetic states combines geometrical frustration with quantum-tunneling effects. Spin-ice materials are canonical examples of frustration, and Ising spins in a transverse magnetic field are the simplest many-body model of quantum tunneling. Here, we show that the tripod kagome lattice material Ho3Mg2Sb2O14 unites an ice-like magnetic degeneracy with quantum-tunneling terms generated by an intrinsic splitting of the Ho3+ ground-state doublet. Using neutron scattering and thermodynamic experiments, we observe a symmetry-breaking transition at Τ approximately equal} 0.32 K to a remarkable quantum state with three peculiarities: a macroscopic degeneracy of ice-like microstates; a fragmentation of the spin into periodic and aperiodic components; and persistent spin fluctuations down to Τ approximately equal} 0.12K. A model incorporating the interplay of frustration and quantum dynamics is necessary to explain our scattering data. Our results establish Ho3Mg2Sb3O14 realizes quantum kagome ice, a frustrated Ising model with intrinsic homogeneous transverse field.
Physical Review X


quantum kagome ice


Dun, Z. , Bai, X. , Paddison, J. , Hollingworth, E. , Butch, N. , Cruz, C. , Stone, M. , Hong, T. , Demmel, F. , Mourigal, M. and Zhou, H. (2020), Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho<sub>3</sub>Mg<sub>2</sub>Sb<sub>3</sub>O<sub>14</sub>, Physical Review X (Accessed August 9, 2022)
Created September 28, 2020, Updated September 20, 2021