Noncollinear Magnetic Structure and Multipolar Order in Eu2Ir2O7

Wang, Yilin; Weng, Hongming; Fu, Liang; Dai, Xi

doi:10.1103/physrevlett.119.187203

Title: Noncollinear Magnetic Structure and Multipolar Order in ${Eu}_{2} {Ir}_{2} O_{7}$

Journal Article · Thu Nov 02 00:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.119.187203· OSTI ID:1505747

Wang, Yilin ^[1]; Weng, Hongming ^[1]; Fu, Liang ^[2]; Dai, Xi ^[3]

Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, and Inst. of Physics
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
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

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.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0010526; 2013CB921700

OSTI ID:: 1505747

Alternate ID(s):: OSTI ID: 1406646

Journal Information:: Physical Review Letters, Vol. 119, Issue 18; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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