Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho 3 Mg 2 Sb 3 O 14

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

doi:10.1103/PhysRevX.10.031069

Title: Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice ${Ho}_{3} {Mg}_{2} {Sb}_{3} O_{14}$

Journal Article · Tue Sep 29 00:00:00 EDT 2020 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.10.031069· OSTI ID:1668450

; Bai, Xiaojian; Paddison, Joseph A. M.; Hollingworth, Emily; Butch, Nicholas P.; Cruz, Clarina D.; Stone, Matthew B.; Hong, Tao; Demmel, Franz; Mourigal, Martin; Zhou, Haidong

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 Ho3Mg2Sb3O14 unites an icelike magnetic degeneracy with quantum-tunneling terms generated by an intrinsic splitting of the Ho3+ ground-state doublet, which is further coupled to a nuclear spin bath. Using neutron scattering and thermodynamic experiments, we observe a symmetry-breaking transition at T∗≈0.32 K to a remarkable state with three peculiarities: a concurrent recovery of magnetic entropy associated with the strongly coupled electronic and nuclear degrees of freedom; a fragmentation of the spin into periodic and icelike components; and persistent inelastic magnetic excitations down to T≈0.12 K. These observations deviate from expectations of classical spin fragmentation on a kagome lattice, but can be understood within a model of dipolar kagome ice under a homogeneous transverse magnetic field, which we survey with exact diagonalization on small clusters and mean-field calculations. In Ho3Mg2Sb3O14, hyperfine interactions dramatically alter the single-ion and collective properties, and suppress possible quantum correlations, rendering the fragmentation with predominantly single-ion quantum fluctuations. Our results highlight the crucial role played by hyperfine interactions in frustrated quantum magnets and motivate further investigations of the role of quantum fluctuations on partially ordered magnetic states.

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)

Grant/Contract Number:: SC0018660; AC05-00OR22725; DMR-2003117

OSTI ID:: 1668450

Alternate ID(s):: OSTI ID: 1673167; OSTI ID: 1798626; OSTI ID: 1997829

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 10 Journal Issue: 3; ISSN 2160-3308

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho 3 Mg 2 Sb 3 O 14

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Title: Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice ${Ho}_{3} {Mg}_{2} {Sb}_{3} O_{14}$