Doping-driven structural distortion in the bilayer iridate (Sr_(1−x)La_x)_3Ir_2O_7
Abstract
Neutron single-crystal diffraction and rotational anisotropy optical second harmonic generation data are presented resolving the nature of the structural distortion realized in electron-doped (Sr_(1−x)La_x)_3Ir_2O_7 with x = 0.035 and x = 0.071. Once electrons are introduced into the bilayer spin-orbit assisted Mott insulator Sr_2Ir_2O_7, previous studies have identified the appearance of a low-temperature structural distortion and have suggested the presence of a competing electronic instability in the phase diagram of this material. Our measurements resolve a lowering of the structural symmetry from monoclinic C2/c to monoclinic P2_1/c and the creation of two unique Ir sites within the chemical unit cell as the lattice distorts below a critical temperature T_S. Details regarding the modifications to oxygen octahedral rotations and tilting through the transition are discussed as well as the evolution of the low-temperature distorted lattice as a function of carrier substitution.
Additional Information
© 2017 American Physical Society. (Received 31 March 2017; revised manuscript received 28 April 2017; published 30 May 2017) This work was supported by NSF Award No. DMR-1505549 (S.D.W., T.H.), as well as by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center (PHY-1125565) with support of the Gordon and Betty Moore Foundation through Grant No. GBMF1250 (D.H., H.C.). Work performed at the ORNL Spallation Neutron Source TOPAZ single-crystal diffractometer was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy, under Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC. VESTA software was used for crystal structure visualization [35].Attached Files
Published - PhysRevB.95.174109.pdf
Submitted - 1705.04720
Supplemental Material - Supplemental_Materials.pdf
Supplemental Material - neutron_035La100K.cif
Supplemental Material - neutron_035La295K.cif
Supplemental Material - neutron_071La100K.cif
Supplemental Material - neutron_071La295K.cif
Files
| Name | Size | Download all |
|---|---|---|
|
md5:d27145402f323d776984b6943b15e9d1
|
928.7 kB | Download |
|
md5:04363094809bbd961d3c8814527f9046
|
8.7 MB | Download |
|
md5:8546a05886dfabc07275ebf2f3a17d9e
|
434.9 kB | Download |
|
md5:3f38f83d9a780c6c487edd04d698f6a9
|
1.7 MB | Preview Download |
|
md5:e7872367b41de15ae3167ccbae84c792
|
2.4 MB | Preview Download |
|
md5:7863d0a329af3a02121a911f49c32489
|
1.1 MB | Download |
|
md5:03c37975b7518273507cff2d632177a0
|
160.7 kB | Download |
Additional details
- Alternative title
- Doping-driven structural distortion in the bilayer iridate (Sr1−xLax)3Ir2O7
- Eprint ID
- 77829
- Resolver ID
- CaltechAUTHORS:20170530-122910588
- NSF
- DMR-1505549
- Institute for Quantum Information and Matter (IQIM)
- NSF
- PHY-1125565
- Gordon and Betty Moore Foundation
- GBMF1250
- Department of Energy (DOE)
- DE-AC05-00OR22725
- Created
-
2017-05-30Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field
- Caltech groups
- Institute for Quantum Information and Matter