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Title: Noncollinear Magnetic Structure and Multipolar Order in Eu 2 Ir 2 O 7

Abstract

The magnetic properties of the pyrochlore iridate material Eu2Ir2O7 (5d5) have been studied based on first principles calculations, where the crystal field splitting Δ , spin-orbit coupling (SOC) λ, and Coulomb interaction U within Ir 5 d orbitals all play significant roles. The ground state phase diagram has been obtained with respect to the strength of SOC and Coulomb interaction U , where a stable antiferromagnetic ground state with all-in–all-out (AIAO) spin structure has been found. In addition, another antiferromagnetic state with energy close to AIAO has also been found to be stable. The calculated nonlinear magnetization of the two stable states both have the d -wave pattern but with a π/4 phase difference, which can perfectly explain the experimentally observed nonlinear magnetization pattern. Finally, compared with the results of the nondistorted structure, it turns out that the trigonal lattice distortion is crucial for stabilizing the AIAO state in Eu2Ir2O7. Furthermore, besides large dipolar moments, we also find considerable octupolar moments in the magnetic states.

Authors:
 [1];  [1];  [2];  [3]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, and Inst. of Physics
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
  3. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, and Inst. of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China); Univ. of Science and Technology of China, Hong Kong (China). Dept. of Physics
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1505747
Alternate Identifier(s):
OSTI ID: 1406646
Grant/Contract Number:  
SC0010526; 2013CB921700
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 18; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Wang, Yilin, Weng, Hongming, Fu, Liang, and Dai, Xi. Noncollinear Magnetic Structure and Multipolar Order in Eu2Ir2O7. United States: N. p., 2017. Web. doi:10.1103/physrevlett.119.187203.
Wang, Yilin, Weng, Hongming, Fu, Liang, & Dai, Xi. Noncollinear Magnetic Structure and Multipolar Order in Eu2Ir2O7. United States. doi:10.1103/physrevlett.119.187203.
Wang, Yilin, Weng, Hongming, Fu, Liang, and Dai, Xi. Thu . "Noncollinear Magnetic Structure and Multipolar Order in Eu2Ir2O7". United States. doi:10.1103/physrevlett.119.187203. https://www.osti.gov/servlets/purl/1505747.
@article{osti_1505747,
title = {Noncollinear Magnetic Structure and Multipolar Order in Eu2Ir2O7},
author = {Wang, Yilin and Weng, Hongming and Fu, Liang and Dai, Xi},
abstractNote = {The magnetic properties of the pyrochlore iridate material Eu2Ir2O7 (5d5) have been studied based on first principles calculations, where the crystal field splitting Δ , spin-orbit coupling (SOC) λ, and Coulomb interaction U within Ir 5 d orbitals all play significant roles. The ground state phase diagram has been obtained with respect to the strength of SOC and Coulomb interaction U , where a stable antiferromagnetic ground state with all-in–all-out (AIAO) spin structure has been found. In addition, another antiferromagnetic state with energy close to AIAO has also been found to be stable. The calculated nonlinear magnetization of the two stable states both have the d -wave pattern but with a π/4 phase difference, which can perfectly explain the experimentally observed nonlinear magnetization pattern. Finally, compared with the results of the nondistorted structure, it turns out that the trigonal lattice distortion is crucial for stabilizing the AIAO state in Eu2Ir2O7. Furthermore, besides large dipolar moments, we also find considerable octupolar moments in the magnetic states.},
doi = {10.1103/physrevlett.119.187203},
journal = {Physical Review Letters},
number = 18,
volume = 119,
place = {United States},
year = {2017},
month = {11}
}

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Cited by: 2 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) AF1, the AIAO antiferromagnetic configuration, all the magnetic moments point to (against) the center of the tetrahedron. (b),(c) AF2, other twofold degenerate antiferromagnetic configurations. (d),(e),(f) AF3, other threefold degenerate antiferromagnetic configurations.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.