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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 ]

Abstract

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 TMI = 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 TMI 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.

Authors:
 [1];  [1];  [2];  [2];  [3];  [4];  [4];  [4];  [1]
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  1. Univ. of Toronto, Toronto, ON (Canada)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Canadian Light Source, Saskatoon, SK (Canada)
  4. Univ. of Tokyo, Kashiwa (Japan)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1461517
Alternate Identifier(s):
OSTI ID: 1434977
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 17; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Chun, Sae Hwan, Yuan, Bo, Casa, Diego, Kim, Jungho, Kim, Chang -Yong, Tian, Zhaoming, Qiu, Yang, Nakatsuji, Satoru, and Kim, Young -June. 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]. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.177203.
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Chun, Sae Hwan, Yuan, Bo, Casa, Diego, Kim, Jungho, Kim, Chang -Yong, Tian, Zhaoming, Qiu, Yang, Nakatsuji, Satoru, & Kim, Young -June. 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]. United States. https://doi.org/10.1103/PhysRevLett.120.177203
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Chun, Sae Hwan, Yuan, Bo, Casa, Diego, Kim, Jungho, Kim, Chang -Yong, Tian, Zhaoming, Qiu, Yang, Nakatsuji, Satoru, and Kim, Young -June. Fri . "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]". United States. https://doi.org/10.1103/PhysRevLett.120.177203. https://www.osti.gov/servlets/purl/1461517.
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@article{osti_1461517,
title = {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]},
author = {Chun, Sae Hwan and Yuan, Bo and Casa, Diego and Kim, Jungho and Kim, Chang -Yong and Tian, Zhaoming and Qiu, Yang and Nakatsuji, Satoru and Kim, Young -June},
abstractNote = {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 TMI = 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 TMI 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.},
doi = {10.1103/PhysRevLett.120.177203},
journal = {Physical Review Letters},
number = 17,
volume = 120,
place = {United States},
year = {Fri Apr 27 00:00:00 EDT 2018},
month = {Fri Apr 27 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/PhysRevLett.120.177203
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Cited by: 11 works
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Figures / Tables:

FIG. 1. FIG. 1.: The RIXS spectra at T = 7 K. The spectrum at (7, 7,7), the center of the structural and magnetic Brillouin zone,displays the elastic line profile fitted by Gaussian line profile with FWHM = 28 meV (Top). The intensity is reduced by a factor of 104 for comparisonmore » with the other spectra. The fitting curves for the spectra at q = (0.1, 0.1, 0.1) and (0.5, 0.5, 0.5) (q ≡ Q−G) comprise the elastic background (solid black), inelastic peak from the magnetic excitation (red), and inelastic background continuum (dashed black) (Middle and Bottom). The spectra are shifted vertically for clarity.« less
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