Phonon excitations in Eu2Ir2O7probed by inelastic x-ray scattering

Han Wang; Ryoma Kaneko; Kentaro Ueda; Yang Zhang; Alfred Q R Baron; Daisuke Ishikawa; Björn Wehinger; Elbio Dagotto; Yoshinori Tokura; Taka-Hisa Arima; Shang Gao

doi:10.1088/1361-648X/ad604d

Phonon excitations in Eu₂Ir₂O₇probed by inelastic x-ray scattering

J Phys Condens Matter. 2024 Jul 23;36(42). doi: 10.1088/1361-648X/ad604d.

Authors

Han Wang¹, Ryoma Kaneko^{2

3}, Kentaro Ueda^{2

3}, Yang Zhang⁴, Alfred Q R Baron⁵, Daisuke Ishikawa⁵, Björn Wehinger⁶, Elbio Dagotto^{4

7}, Yoshinori Tokura^{2

3

8}, Taka-Hisa Arima^{2

9}, Shang Gao^{1

2}

Affiliations

¹ Department of Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China.
² RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan.
³ Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
⁴ Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, United States of America.
⁵ Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo 679-5198, Japan.
⁶ European Synchrotron Radiation Facility, 71, Avenue des Martyrs, Grenoble 38000, France.
⁷ Materials Science and Technology Division, Oak Ridge National Laboratory, TN 37831, United States of America.
⁸ Tokyo College, University of Tokyo, Tokyo 113-8656, Japan.
⁹ Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan.

PMID: 38976987
DOI: 10.1088/1361-648X/ad604d

Abstract

The study of phonon dynamics and its interplay with magnetic ordering is crucial for understanding the unique quantum phases in the pyrochlore iridates. Here, through inelastic x-ray scattering on a single crystal sample of the pyrochlore iridate Eu₂Ir₂O₇, we map out the phonon excitation spectra in Eu₂Ir₂O₇and compare them with the theoretical phonon spectra calculated using the density functional theory. Possible phonon renormalization across the magnetic long-range order transition is observed in our experiments, which is consistent with the results of the previous Raman scattering experiments.

Keywords: density functional theory; inelastic x-ray scattering (IXS); phonon excitations; spin–orbit coupling (SOC).