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Doping-driven structural distortion in the bilayer iridate (Sr_(1−x)La_x)_3Ir_2O_7

Hogan, Tom and Wang, Xiaoping and Chu, H. and Hsieh, David and Wilson, Stephen D. (2017) Doping-driven structural distortion in the bilayer iridate (Sr_(1−x)La_x)_3Ir_2O_7. Physical Review B, 95 (17). Art. No. 174109. ISSN 2469-9950. http://resolver.caltech.edu/CaltechAUTHORS:20170530-122910588

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevB.95.174109DOIArticle
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.174109PublisherArticle
https://arxiv.org/abs/1705.04720arXivDiscussion Paper
ORCID:
AuthorORCID
Wang, Xiaoping0000-0001-7143-8112
Chu, H.0000-0002-1989-9517
Hsieh, David0000-0002-0812-955X
Alternate Title:Doping-driven structural distortion in the bilayer iridate (Sr1−xLax)3Ir2O7
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].
Group:Institute for Quantum Information and Matter, IQIM
Funders:
Funding AgencyGrant Number
NSFDMR-1505549
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
NSFPHY-1125565
Gordon and Betty Moore FoundationGBMF1250
Department of Energy (DOE) DE-AC05-00OR22725
Issue or Number:17
Record Number:CaltechAUTHORS:20170530-122910588
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170530-122910588
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77829
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:30 May 2017 20:17
Last Modified:22 Aug 2019 21:32

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