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Title: Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4

Abstract

The mixing of orbital and spin character in the wavefunctions of the 5d iridates has led to predictions of strong couplings between their lattice, electronic and magnetic degrees of freedom. As well as realising a novel spin-orbit assisted Mott-insulating ground state, the perovskite iridate Sr 2IrO 4 has strong similarities with the cuprate La 2CuO 4, which on doping hosts a charge density wave that appears intimately connected to high-temperature superconductivity. These phenomena can be sensitively probed through momentum-resolved measurements of the lattice dynamics, made possible by meV-resolution inelastic x-ray scattering. Here we report the rst such measurements for both parent and electron-doped Sr2IrO4. We nd that the low-energy phonon dispersions and intensities in both compounds are well described by the same non-magnetic DFT calculation. In the parent compound, no changes of the phonons upon magnetic ordering are discernible within the experimental resolution, and in the doped compound no anomalies are apparent due to charge density waves. These measurements extend our knowledge of the lattice properties of (Sr 1-xLa x) 2IrO 4, and constrain the couplings of the phonons to magnetic and charge order.

Authors:
 [1];  [2];  [1];  [3];  [4];  [4];  [4];  [1];  [5];  [6];  [7];  [3];  [1]; ORCiD logo [2]
  1. Univ. College London (United Kingdom)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. RIKEN, Sayo Hyogo (Japan)
  4. Ural Federal Univ., Ekaterinburg (Russian Federation)
  5. Univ. of Colorado, Boulder, CO (United States)
  6. California Inst. of Technology (CalTech), Pasadena, CA (United States); Univ. of Geneva (Switzerland)
  7. Univ. of Geneva (Switzerland)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1557108
Alternate Identifier(s):
OSTI ID: 1558157
Report Number(s):
BNL-211965-2019-JAAM
Journal ID: ISSN 2469-9950
Grant/Contract Number:  
SC0012704; 1047478; SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 8; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Dashwood, C. D., Miao, H., Vale, J. G., Ishikawa, D., Prishchenko, D. A., Mazurenko, V. V., Mazurenko, V. G., Perry, R. S., Cao, G., de la Torre, A., Baumberger, F., Baron, A. Q. R., McMorrow, D. F., and Dean, Mark P. Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.085131.
Dashwood, C. D., Miao, H., Vale, J. G., Ishikawa, D., Prishchenko, D. A., Mazurenko, V. V., Mazurenko, V. G., Perry, R. S., Cao, G., de la Torre, A., Baumberger, F., Baron, A. Q. R., McMorrow, D. F., & Dean, Mark P. Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4. United States. doi:10.1103/PhysRevB.100.085131.
Dashwood, C. D., Miao, H., Vale, J. G., Ishikawa, D., Prishchenko, D. A., Mazurenko, V. V., Mazurenko, V. G., Perry, R. S., Cao, G., de la Torre, A., Baumberger, F., Baron, A. Q. R., McMorrow, D. F., and Dean, Mark P. Fri . "Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4". United States. doi:10.1103/PhysRevB.100.085131.
@article{osti_1557108,
title = {Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4},
author = {Dashwood, C. D. and Miao, H. and Vale, J. G. and Ishikawa, D. and Prishchenko, D. A. and Mazurenko, V. V. and Mazurenko, V. G. and Perry, R. S. and Cao, G. and de la Torre, A. and Baumberger, F. and Baron, A. Q. R. and McMorrow, D. F. and Dean, Mark P.},
abstractNote = {The mixing of orbital and spin character in the wavefunctions of the 5d iridates has led to predictions of strong couplings between their lattice, electronic and magnetic degrees of freedom. As well as realising a novel spin-orbit assisted Mott-insulating ground state, the perovskite iridate Sr2IrO4 has strong similarities with the cuprate La2CuO4, which on doping hosts a charge density wave that appears intimately connected to high-temperature superconductivity. These phenomena can be sensitively probed through momentum-resolved measurements of the lattice dynamics, made possible by meV-resolution inelastic x-ray scattering. Here we report the rst such measurements for both parent and electron-doped Sr2IrO4. We nd that the low-energy phonon dispersions and intensities in both compounds are well described by the same non-magnetic DFT calculation. In the parent compound, no changes of the phonons upon magnetic ordering are discernible within the experimental resolution, and in the doped compound no anomalies are apparent due to charge density waves. These measurements extend our knowledge of the lattice properties of (Sr1-xLax)2IrO4, and constrain the couplings of the phonons to magnetic and charge order.},
doi = {10.1103/PhysRevB.100.085131},
journal = {Physical Review B},
number = 8,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}

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