Multiphase magnetism in Yb2Ti2O7.
Proc Natl Acad Sci U S A
; 117(44): 27245-27254, 2020 11 03.
Article
em En
| MEDLINE
| ID: mdl-33097668
ABSTRACT
We use neutron scattering to show that ferromagnetism and antiferromagnetism coexist in the low T state of the pyrochlore quantum magnet [Formula see text] 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 [Formula see text]-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 [Formula see text] is a consequence of this multiphase magnetism.
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MEDLINE
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Ano de publicação:
2020
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Article