Determination of long-range all-in-all-out ordering of Ir<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>moments in a pyrochlore iridate Eu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Ir<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</

Sagayama, Hajime; Uematsu, Daisuke; Arima, T.; Sugimoto, Kunihisa; Ishikawa, Jun; O’Farrell, Eoin; Nakatsuji, Satoru

doi:10.1103/physrevb.87.100403

Cited by 158 publications

(161 citation statements)

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“…It is possible that this discrepancy is simply due to differences in sample stoichiometry, as the single crystal sample used in our study was found to be Eu-rich (x = -0.09) while the sample in Ref. 24 was found to be slightly Ir-rich (x < 0.05). However, bulk magnetization measurements on our sample do reveal a clear magnetic transition at T M ∼ 155 K, and in spite of the lack of magnetic Bragg peaks below T M , there is strong evidence of magnetic dynamics provided by RIXS.…”

Section: Discussionmentioning

confidence: 62%

“…Nd moments were found to order in an all-in/all-out fashion, leading the authors to conclude that Ir moments were likely to adopt the same configuration. In a recent resonant x-ray diffraction experiment on Eu 2 Ir 2 O 7 , Sagayama et al 24 directly observed the ordering of Ir magnetic moments with a wave vector of q = 0. Unfortunately, this result alone does not provide sufficient information to unambiguously determine the spin structure.…”

Section: Introductionmentioning

confidence: 99%

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X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations

et al. 2016

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We have investigated the structural, electronic, and magnetic properties of the pyrochlore iridates Eu2Ir2O7 and Pr2Ir2O7 using a combination of resonant elastic x-ray scattering, x-ray powder diffraction, and resonant inelastic x-ray scattering (RIXS). The structural parameters of Eu2Ir2O7 have been examined as a function of temperature and applied pressure, with a particular emphasis on regions of the phase diagram where electronic and magnetic phase transitions have been reported. We find no evidence of crystal symmetry change over the range of temperatures (∼6 to 300 K) and pressures (∼0.1 to 17 GPa) studied. We have also investigated the electronic and magnetic excitations in single crystal samples of Eu2Ir2O7 and Pr2Ir2O7 using high resolution Ir L3-edge RIXS. In spite of very different ground state properties, we find these materials exhibit qualitatively similar excitation spectra, with crystal field excitations at ∼3-5 eV, spin-orbit excitations at ∼0.5-1 eV, and broad low-lying excitations below ∼0.15 eV. In Eu2Ir2O7 we observe highly damped magnetic excitations at ∼45 meV, which display significant momentum dependence. We compare these results with recent dynamical structure factor calculations.

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Section: Discussionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations

et al. 2016

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“…17 On the other hand, for related iridium pyrochlore oxides that show similar MITs, 18,19 it has been also suggested that an AIAO order of Ir moments is realized in their insulating states. [20][21][22][23] The AIAO order is theoretically predicted for Cd 2 Os 2 O 7 by Chern and Batista on a simple double-exchange model without spin-orbit coupling (SOC). 15 However, the importance of SOC has been well recognized in determining the electronic structure 10,11 and is actually evidenced by means of x-ray magnetic circular dichroism.…”

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confidence: 98%

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd₂Os₂O₇

et al. 2015

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We investigate the metal-insulator transition (MIT) of the osmium pyrochlore oxide Cd 2 Os 2 O 7 through transport and magnetization measurements. The MIT and a magnetic transition to the all-in/all-out (AIAO) order occur simultaneously at 227 K. We propose a mechanism based on a Lifshitz transition induced by the AIAO magnetic order probably via strong spin-orbit couplings in the specific semimetallic band structure. It is suggested, moreover, that two observed puzzles, a finite conductivity near T = 0 and an emergence of weak ferromagnetic moments, are not bulk properties but originate at magnetic domain walls between two kinds of AIAO domains.

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“…These compounds show a crossover from metal to insulator with decreasing A 3+ ionic radii at high T [32,33]. The Ir magnetic moments form a socalled all-in/all-out non-collinear magnetic state at low T for small A 3+ ionic [35][36][37]. Y 2 Ir 2 O 7 is the insulating compound with the highest magnetic transition temperature and no f moments.…”

Section: Pyrochlore Iridatesmentioning

confidence: 99%

Quantum Monte Carlo impurity solvers for multi-orbital problems and frequency-dependent interactions

Shinaoka

Assaad

Blümer

et al. 2017

Eur. Phys. J. Spec. Top.

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Abstract. The solution of an auxiliary quantum impurity system is the computationally expensive step in dynamical mean field theory simulations of lattice models and materials. In this review, we discuss Monte Carlo based impurity solvers, which are suitable for a wide range of applications. In particular, we present an efficient implementation of the hybridization expansion approach, which enables the simulation of multiorbital impurity problems with off-diagonal and complex hybridizations, and dynamically screened (retarded) density-density interactions. As a complementary approach, we discuss an impurity solver based on the determinant Monte Carlo method, which scales favorably with inverse temperature and hence provides access to the very low temperature regime. The usefulness of these state-of-the-art impurity solvers is demonstrated with applications to the downfolding problem, i.e., the systematic derivation of dynamically screened interactions for low-energy effective models, and to pyrochlore iridates, where the spin-orbit coupling leads to complex hybridization functions in a multi-orbital system. As a benchmark for cluster extensions of dynamical mean field theory, we also present results from lattice Monte Carlo simulations for the momentum dependence of the pseudo-gap in the half-filled two-dimensional Hubbard model.

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Determination of long-range all-in-all-out ordering of Ir4+moments in a pyrochlore iridate Eu2Ir2

Cited by 158 publications

References 31 publications

X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations

X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd₂Os₂O₇

Quantum Monte Carlo impurity solvers for multi-orbital problems and frequency-dependent interactions

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Determination of long-range all-in-all-out ordering of Ir4+moments in a pyrochlore iridate Eu2Ir2

Cited by 158 publications

References 31 publications

X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations

X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd2Os2O7

Quantum Monte Carlo impurity solvers for multi-orbital problems and frequency-dependent interactions

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Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd₂Os₂O₇