Orthogonal magnetization and symmetry breaking in pyrochlore iridate Eu2Ir2O7
Abstract
We present that 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 TN ~ 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 ω. Lastlyl, 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 TN, suggestive of an additional order parameter η already present at 300 K.
- Authors:
-
- Princeton Univ., NJ (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Univ. of Tokyo (Japan)
- Univ. of Tokyo (Japan); CREST, Japan Science and Technology Agency (JST), Saitama (Japan)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1535092
- Grant/Contract Number:
- SC0010526
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Physics
- Additional Journal Information:
- Journal Volume: 13; Journal Issue: 6; Journal ID: ISSN 1745-2473
- Publisher:
- Nature Publishing Group (NPG)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE
Citation Formats
Liang, Tian, Hsieh, Timothy H., Ishikawa, Jun J., Nakatsuji, Satoru, Fu, Liang, and Ong, N. P. Orthogonal magnetization and symmetry breaking in pyrochlore iridate Eu2Ir2O7. United States: N. p., 2017.
Web. doi:10.1038/nphys4051.
Liang, Tian, Hsieh, Timothy H., Ishikawa, Jun J., Nakatsuji, Satoru, Fu, Liang, & Ong, N. P. Orthogonal magnetization and symmetry breaking in pyrochlore iridate Eu2Ir2O7. United States. https://doi.org/10.1038/nphys4051
Liang, Tian, Hsieh, Timothy H., Ishikawa, Jun J., Nakatsuji, Satoru, Fu, Liang, and Ong, N. P. Mon .
"Orthogonal magnetization and symmetry breaking in pyrochlore iridate Eu2Ir2O7". United States. https://doi.org/10.1038/nphys4051. https://www.osti.gov/servlets/purl/1535092.
@article{osti_1535092,
title = {Orthogonal magnetization and symmetry breaking in pyrochlore iridate Eu2Ir2O7},
author = {Liang, Tian and Hsieh, Timothy H. and Ishikawa, Jun J. and Nakatsuji, Satoru and Fu, Liang and Ong, N. P.},
abstractNote = {We present that 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 TN ~ 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 ω. Lastlyl, 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 TN, suggestive of an additional order parameter η already present at 300 K.},
doi = {10.1038/nphys4051},
journal = {Nature Physics},
number = 6,
volume = 13,
place = {United States},
year = {Mon Feb 27 00:00:00 EST 2017},
month = {Mon Feb 27 00:00:00 EST 2017}
}
Web of Science
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