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

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.

doi:10.1103/PhysRevB.100.085131

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

Journal Article · 30 August 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.085131 · OSTI ID:1557108

Dashwood, C. D. ^[1]; Miao, H. ^[2]; Vale, J. G. ^[1]; Ishikawa, D. ^[3]; Prishchenko, D. A. ^[4]; Mazurenko, V. V. ^[4]; Mazurenko, V. G. ^[4]; Perry, R. S. ^[1]; Cao, G. ^[5]; de la Torre, A. ^[6]; Baumberger, F. ^[7]; Baron, A. Q. R. ^[3]; McMorrow, D. F. ^[1];

^[2]

Univ. College London (United Kingdom)
Brookhaven National Lab. (BNL), Upton, NY (United States)
RIKEN, Sayo Hyogo (Japan)
Ural Federal Univ., Ekaterinburg (Russian Federation)
Univ. of Colorado, Boulder, CO (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States); Univ. of Geneva (Switzerland)
Univ. of Geneva (Switzerland)

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 (Sr_1-xLa_x)₂IrO₄, and constrain the couplings of the phonons to magnetic and charge order.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; 1047478; SC00112704

OSTI ID:: 1557108

Alternate ID(s):: OSTI ID: 1558157

Report Number(s):: BNL-211965-2019-JAAM

Journal Information:: Physical Review B, Vol. 100, Issue 8; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Data for "Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4" Dashwood, Cameron https://doi.org/10.5522/04/14596077 The current record is supplemented by this dataset	dataset	January 2021
Raw data for "Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4" Dashwood, Cameron https://doi.org/10.5522/04/14596077.v1 The current record is supplemented by this dataset	dataset	January 2021
Data for "Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4" Dashwood, Cameron https://doi.org/10.5522/04/14596077.v2 The current record is supplemented by this dataset	dataset	January 2021

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

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