Multiphase magnetism in Yb 2 Ti 2 O 7

Scheie, Allen; Kindervater, Jonas; Zhang, Shu; Changlani, Hitesh J.; Sala, Gabriele; Ehlers, Georg; Heinemann, Andre; Tucker, Gregory S.; Koohpayeh, Seyed M.; Broholm, Collin

doi:10.1073/pnas.2008791117

Title: Multiphase magnetism in Yb ₂ Ti ₂ O ₇

Journal Article · Fri Oct 23 00:00:00 EDT 2020 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.2008791117· OSTI ID:1686214

; Kindervater, Jonas; Zhang, Shu;

;

; Ehlers, Georg; Heinemann, Andre; Tucker, Gregory S.; Koohpayeh, Seyed M.;

We use neutron scattering to show that ferromagnetism and antiferromagnetism coexist in the low T state of the pyrochlore quantum magnet ${Yb}_{2} {Ti}_{2} O_{7}$ . 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 from $⟨ 111 ⟩$ -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 characterizing ${Yb}_{2} {Ti}_{2} O_{7}$ is a consequence of this multiphase magnetism.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; SC0019331; GBMF-4532; DMR190020; DMR-1644779

OSTI ID:: 1686214

Alternate ID(s):: OSTI ID: 1756278

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 117 Journal Issue: 44; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Multiphase magnetism in Yb 2 Ti 2 O 7

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Title: Multiphase magnetism in Yb ₂ Ti ₂ O ₇