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Title: 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:
 [1];  [2];  [3];  [4];  [2];  [1]
  1. Princeton Univ., NJ (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Univ. of Tokyo (Japan)
  4. 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:
Journal Article: 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. 2017. "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},
url = {https://www.osti.gov/biblio/1535092}, journal = {Nature Physics},
issn = {1745-2473},
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}
}

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Cited by: 22 works
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Works referenced in this record:

Tetrahedral Magnetic Order and the Metal-Insulator Transition in the Pyrochlore Lattice of Cd 2 Os 2 O 7
journal, June 2012


Emergence of Magnetic Long-range Order in Frustrated Pyrochlore Nd 2 Ir 2 O 7 with Metal–Insulator Transition
journal, March 2012


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journal, September 2012


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journal, August 2008


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journal, March 2010


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journal, December 2009


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conference, January 2006

  • Narumi, Yasuo; Kikkawa, Akiko; Katsumata, Koichi
  • LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24, AIP Conference Proceedings
  • https://doi.org/10.1063/1.2355092

Metal–Insulator Transitions in Pyrochlore Oxides Ln 2 Ir 2 O 7
journal, September 2011


Magnetic transition, long-range order, and moment fluctuations in the pyrochlore iridate Eu 2 Ir 2 O 7
journal, May 2011


Phase-Sensitive Observation of a Spin-Orbital Mott State in Sr2IrO4
journal, March 2009


Pressure-tuned insulator to metal transition in Eu 2 Ir 2 O 7
journal, May 2012


Mobile metallic domain walls in an all-in-all-out magnetic insulator
journal, October 2015


Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates
journal, May 2011


Continuous transition between antiferromagnetic insulator and paramagnetic metal in the pyrochlore iridate Eu 2 Ir 2 O 7
journal, June 2012


Metal–Insulator Transition in Pyrochlore Iridates Ln 2 Ir 2 O 7 ( Ln = Nd, Sm, and Eu)
journal, April 2007


Multipole Orders and Fluctuations in Strongly Correlated Electron Systems
journal, July 2009


Works referencing / citing this record:

Local orbital degeneracy lifting as a precursor to an orbital-selective Peierls transition
journal, August 2019


Longitudinal spin Seebeck effect in pyrochlore iridates with bulk and interfacial Dzyaloshinskii-Moriya interaction
journal, January 2020


Robust pinning of magnetic moments in pyrochlore iridates
journal, September 2017


Noncollinear Magnetic Structure and Multipolar Order in Eu 2 Ir 2 O 7
journal, November 2017


Robust pinning of magnetic moments in pyrochlore iridates
text, January 2017


Local orbital degeneracy lifting as a precursor to an orbital-selective Peierls transition
journal, August 2019