Fragmented monopole crystal, dimer entropy and Coulomb interactions in Dy${}_2$Ir${}_2$O${}_7$

Abstract

Neutron scattering, specific heat and magnetisation measurements on both powders and single crystals reveal that Dy${}_2$Ir${}_2$O${}_7$ realizes the fragmented monopole crystal state in which antiferromagnetic order and a Coulomb phase spin liquid co-inhabit. The measured residual entropy is that of a hard core dimer liquid, as predicted. Inclusion of Coulomb interactions allows for a quantitative description of both the thermodynamic data and the magnetisation dynamics, with the energy scale given by deconfined defects in the emergent ionic crystal. Our data reveal low energy excitations, as well as a large distribution of energy barriers down to low temperatures, while the magnetic response to an applied field suggests that domain wall pinning is important; results that call for further theoretical modelling.

arXiv comment6 pages + supp. mat. 6 pages

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Cited by in corpus (14)

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• Absence of moment fragmentation in the mixed $B$-site pyrochlore Nd${}_2$GaSbO${}_7$
• Fragmented spin ice and multi-$k$ ordering in rare-earth antiperovskites
• A resonant valence bond spin liquid in the dilute limit of doped frustrated Mott insulators
• Magnetotransport of single crystal Sm${}_2$Ir${}_2$O${}_7$ across the pressure-induced quantum-critical phase boundary
• The magnetic behaviour of Dy${}_2$Ir${}_2$O${}_7$ -- beyond the mean field approximation
• Dynamical Axions in $U(1)$ Quantum Spin Liquids
• Electric activity at magnetic moment fragmentation in spin ice
• Neutron scattering from fragmented frustrated magnets
• Vison crystal in quantum spin ice on the breathing pyrochlore lattice
• Ferromagnetic fragmented state in the pyrochlore Ho${}_2$Ru${}_2$O${}_7$
• Theta electromagnetism in quantum spin ice: Microscopic analysis of improper symmetries
• Enhanced-Entropy Phases in Geometrically Frustrated Pyrochlore Magnets