%AScheie, Allen%AKindervater, Jonas%AZhang, Shu%AChanglani, Hitesh%ASala, Gabriele%AEhlers, Georg%AHeinemann, Andre%ATucker, Gregory%AKoohpayeh, Seyed%ABroholm, Collin%BJournal Name: Proceedings of the National Academy of Sciences; Journal Volume: 117; Journal Issue: 44; Related Information: CHORUS Timestamp: 2020-11-12 21:12:06 %D2020%IProceedings of the National Academy of Sciences %JJournal Name: Proceedings of the National Academy of Sciences; Journal Volume: 117; Journal Issue: 44; Related Information: CHORUS Timestamp: 2020-11-12 21:12:06 %K %MOSTI ID: 10199102 %PMedium: X %TMultiphase magnetism in Yb 2 Ti 2 O 7 %X

We use neutron scattering to show that ferromagnetism and antiferromagnetism coexist in the low T state of the pyrochlore quantum magnetYb2Ti2O7. While magnetic Bragg peaks evidence long-range static ferromagnetic order, inelastic scattering shows that short-range correlated antiferromagnetism is also present. Small-angle neutron scattering provides direct evidence for mesoscale magnetic structure that we associate with metastable antiferromagnetism. Classical Monte Carlo simulations based on exchange interactions inferred from111-oriented high-field spin wave measurements confirm that antiferromagnetism is metastable within the otherwise ferromagnetic ground state. The apparent lack of coherent spin wave excitations and strong sensitivity to quenched disorder characterizingYb2Ti2O7is a consequence of this multiphase magnetism.

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