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Orthogonal magnetization and symmetry breaking in pyrochlore iridate Eu2Ir2O7

Author(s)
Liang, Tian; Ishikawa, Jun J.; Nakatsuji, Satoru; Ong, N. P.; Hsieh, Timothy Hwa-wei; Fu, Liang; ... Show more Show less
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Abstract
Electrons in the pyrochlore iridates experience a large interaction energy in addition to a strong spin-orbit interaction. Both features make the iridates promising for realizing novel states such as the topological Mott insulator.The pyrochlore iridate Eu₂Ir₂O₇ shows a metal-insulator transition at T[subscript N] 1/4 120 K below which a magnetically ordered state develops. Using torque magnetometry, we uncover an unusual magnetic response. A magnetic field H applied in its a-b plane produces a nonlinear magnetization M⊥ orthogonal to the plane. M⊥ displays a d-wave field-angle pattern consistent with octupolar order, with a handedness dictated by field cooling, leading to symmetry breaking of the chirality. A surprise is that the lobe orientation of the d-wave pattern is sensitive to the direction of the field when the sample is field-cooled below T[subscript N], suggestive of an additional order parameter 𝞰 already present at 300 K.
Date issued
2017-02
URI
http://hdl.handle.net/1721.1/120540
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Nature Physics
Publisher
Springer Nature
Citation
Liang, Tian et al. “Orthogonal Magnetization and Symmetry Breaking in Pyrochlore Iridate Eu2Ir2O7.” Nature Physics 13, 6 (February 2017): 599–603 © 2017 Macmillan Publishers Limited, part of Springer Nature
Version: Author's final manuscript
ISSN
1745-2473
1745-2481

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