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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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
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
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