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Published May 1, 2017 | Published + Supplemental Material + Submitted
Journal Article Open

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

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Additional details

Created:
August 19, 2023
Modified:
October 25, 2023