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Title: Coupled Raman-Raman modes in the ionic Raman scattering process

Abstract

We employ a lattice Hamiltonian to examine the dynamics of coupled normal modes excited through a nonlinear phononic process, extending the model beyond infrared and first-order Raman active mode couplings to include interactions between symmetry-allowed Raman active modes. We examine the strength of the interactions between two Raman active modes on the targeted driven-mode dynamics to confirm that all symmetry allowed Raman modes interact with each other. We apply the model to the correlated insulating ferromagnet YTiO3 and present the resulting renormalization effects on the driven-mode dynamics from the anharmonic interactions. Owing to the dependence of the displacive amplitude of the Raman active mode on such interactions, especially for those modes with small amplitude, we suggest that models of anharmonic phononic coupling in materials with electronic, ferroic, or superconducting properties derived from competing Raman-like distortions should include these low-order terms in the equations of motion describing the excited phonons to obtain accurate physical models.

Authors:
 [1]; ORCiD logo [1]
  1. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540254
Alternate Identifier(s):
OSTI ID: 1470790
Grant/Contract Number:  
SC0012375; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 11; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Physics

Citation Formats

Gu, Mingqiang, and Rondinelli, James M. Coupled Raman-Raman modes in the ionic Raman scattering process. United States: N. p., 2018. Web. doi:10.1063/1.5048037.
Gu, Mingqiang, & Rondinelli, James M. Coupled Raman-Raman modes in the ionic Raman scattering process. United States. doi:10.1063/1.5048037.
Gu, Mingqiang, and Rondinelli, James M. Mon . "Coupled Raman-Raman modes in the ionic Raman scattering process". United States. doi:10.1063/1.5048037.
@article{osti_1540254,
title = {Coupled Raman-Raman modes in the ionic Raman scattering process},
author = {Gu, Mingqiang and Rondinelli, James M.},
abstractNote = {We employ a lattice Hamiltonian to examine the dynamics of coupled normal modes excited through a nonlinear phononic process, extending the model beyond infrared and first-order Raman active mode couplings to include interactions between symmetry-allowed Raman active modes. We examine the strength of the interactions between two Raman active modes on the targeted driven-mode dynamics to confirm that all symmetry allowed Raman modes interact with each other. We apply the model to the correlated insulating ferromagnet YTiO3 and present the resulting renormalization effects on the driven-mode dynamics from the anharmonic interactions. Owing to the dependence of the displacive amplitude of the Raman active mode on such interactions, especially for those modes with small amplitude, we suggest that models of anharmonic phononic coupling in materials with electronic, ferroic, or superconducting properties derived from competing Raman-like distortions should include these low-order terms in the equations of motion describing the excited phonons to obtain accurate physical models.},
doi = {10.1063/1.5048037},
journal = {Applied Physics Letters},
number = 11,
volume = 113,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
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Works referenced in this record:

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