$Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}$
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Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}

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 t...

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Autores principales:	Zhiling Dun, Xiaojian Bai, Joseph A. M. Paddison, Emily Hollingworth, Nicholas P. Butch, Clarina D. Cruz, Matthew B. Stone, Tao Hong, Franz Demmel, Martin Mourigal, Haidong Zhou
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/78696fd6676b4617a94b655e0daaa53c
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spelling	oai:doaj.org-article:78696fd6676b4617a94b655e0daaa53c2021-12-02T13:13:37ZQuantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}10.1103/PhysRevX.10.0310692160-3308https://doaj.org/article/78696fd6676b4617a94b655e0daaa53c2020-09-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.031069http://doi.org/10.1103/PhysRevX.10.031069https://doaj.org/toc/2160-3308A 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 Ho_{3}Mg_{2}Sb_{3}O_{14} unites an icelike magnetic degeneracy with quantum-tunneling terms generated by an intrinsic splitting of the Ho^{3+} 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 Ho_{3}Mg_{2}Sb_{3}O_{14}, 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.Zhiling DunXiaojian BaiJoseph A. M. PaddisonEmily HollingworthNicholas P. ButchClarina D. CruzMatthew B. StoneTao HongFranz DemmelMartin MourigalHaidong ZhouAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 3, p 031069 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Zhiling Dun Xiaojian Bai Joseph A. M. Paddison Emily Hollingworth Nicholas P. Butch Clarina D. Cruz Matthew B. Stone Tao Hong Franz Demmel Martin Mourigal Haidong Zhou Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}
description	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 Ho_{3}Mg_{2}Sb_{3}O_{14} unites an icelike magnetic degeneracy with quantum-tunneling terms generated by an intrinsic splitting of the Ho^{3+} 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 Ho_{3}Mg_{2}Sb_{3}O_{14}, 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.
format	article
author	Zhiling Dun Xiaojian Bai Joseph A. M. Paddison Emily Hollingworth Nicholas P. Butch Clarina D. Cruz Matthew B. Stone Tao Hong Franz Demmel Martin Mourigal Haidong Zhou
author_facet	Zhiling Dun Xiaojian Bai Joseph A. M. Paddison Emily Hollingworth Nicholas P. Butch Clarina D. Cruz Matthew B. Stone Tao Hong Franz Demmel Martin Mourigal Haidong Zhou
author_sort	Zhiling Dun
title	Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}
title_short	Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}
title_full	Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}
title_fullStr	Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}
title_full_unstemmed	Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}
title_sort	quantum versus classical spin fragmentation in dipolar kagome ice ho_{3}mg_{2}sb_{3}o_{14}
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/78696fd6676b4617a94b655e0daaa53c
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Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho_{3}Mg_{2}Sb_{3}O_{14}

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