Magnetic Excitations across the Metal-Insulator Transition in the Pyrochlore Iridate Eu2Ir2O7 [Evolution of Magnetic Excitations across the Metal-Insulator Transition in the Pyrochlore Iridate Eu2Ir2O7]

Chun, Sae Hwan; Yuan, Bo; Casa, Diego; Kim, Jungho; Kim, Chang -Yong; Tian, Zhaoming; Qiu, Yang; Nakatsuji, Satoru; Kim, Young -June

doi:10.1103/PhysRevLett.120.177203

Title: Magnetic Excitations across the Metal-Insulator Transition in the Pyrochlore Iridate ${Eu}_{2} {Ir}_{2} O_{7}$ [Evolution of Magnetic Excitations across the Metal-Insulator Transition in the Pyrochlore Iridate ${Eu}_{2} {Ir}_{2} O_{7}$ ]

Journal Article · 26 April 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.120.177203 · OSTI ID:1461517

Chun, Sae Hwan ^[1]; Yuan, Bo ^[1]; Casa, Diego ^[2]; Kim, Jungho ^[2]; Kim, Chang -Yong ^[3]; Tian, Zhaoming ^[4]; Qiu, Yang ^[4]; Nakatsuji, Satoru ^[4]; Kim, Young -June ^[1]

Univ. of Toronto, Toronto, ON (Canada)
Argonne National Lab. (ANL), Argonne, IL (United States)
Canadian Light Source, Saskatoon, SK (Canada)
Univ. of Tokyo, Kashiwa (Japan)

Here, we report a resonant inelastic x-ray scattering study of the magnetic excitation spectrum in a highly insulating Eu₂Ir₂O₇ single crystal that exhibits a metal-insulator transition at T_MI = 111(7) K. A propagating magnon mode with a 20 meV bandwidth and a 28 meV magnon gap is found in the excitation spectrum at 7 K, which is expected in the all-in-all-out magnetically ordered state. This magnetic excitation exhibits substantial softening as the temperature is raised towards T_MI and turns into a highly damped excitation in the paramagnetic phase. Remarkably, the softening occurs throughout the whole Brillouin zone including the zone boundary. This observation is inconsistent with the magnon renormalization expected in a local moment system and indicates that the strength of the electron correlation in Eu₂Ir₂O₇ is only moderate, so that electron itinerancy should be taken into account in describing its magnetism.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1461517

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 120; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Magnetic Excitations across the Metal-Insulator Transition in the Pyrochlore Iridate Eu 2 Ir 2 O 7 [Evolution of Magnetic Excitations across the Metal-Insulator Transition in the Pyrochlore Iridate Eu 2 Ir 2 O 7 ]

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Title: Magnetic Excitations across the Metal-Insulator Transition in the Pyrochlore Iridate ${Eu}_{2} {Ir}_{2} O_{7}$ [Evolution of Magnetic Excitations across the Metal-Insulator Transition in the Pyrochlore Iridate ${Eu}_{2} {Ir}_{2} O_{7}$ ]