Doping and temperature evolutions of optical response of Sr3(Ir1-x Ru x )2O7

Abstract We report on optical spectroscopic study of the Sr3(Ir1-x Ru x )2O7 system over a wide doping regime. We find that the changes in the electronic structure occur in the limited range of the concentration of Ru ions where the insulator–metal transition occurs. In the insulating regime, the el...

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Autores principales:	Gihyeon Ahn, J. L. Schmehr, Z. Porter, S. D. Wilson, S. J. Moon
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e60d67897ed84be0a728fdf698534db0
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spelling	oai:doaj.org-article:e60d67897ed84be0a728fdf698534db02021-12-02T13:34:00ZDoping and temperature evolutions of optical response of Sr3(Ir1-x Ru x )2O710.1038/s41598-020-79263-52045-2322https://doaj.org/article/e60d67897ed84be0a728fdf698534db02020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79263-5https://doaj.org/toc/2045-2322Abstract We report on optical spectroscopic study of the Sr3(Ir1-x Ru x )2O7 system over a wide doping regime. We find that the changes in the electronic structure occur in the limited range of the concentration of Ru ions where the insulator–metal transition occurs. In the insulating regime, the electronic structure associated with the effective total angular momentum J eff = 1/2 Mott state remains robust against Ru doping, indicating the localization of the doped holes. Upon entering the metallic regime, the Mott gap collapses and the Drude-like peak with strange metallic character appears. The evolution of the electronic structure registered in the optical data can be explained in terms of a percolative insulator–metal transition. The phonon spectra display anomalous doping evolution of the lineshapes. While the phonon modes of the compounds deep in the insulating and metallic regimes are almost symmetric, those of the semiconducting compound with x = 0.34 in close proximity to the doping-driven insulator–metal transition show a pronounced asymmetry. The temperature evolution of the phonon modes of the x = 0.34 compound reveals the asymmetry is enhanced in the antiferromagnetic state. We discuss roles of the S = 1 spins of the Ru ions and charge excitations for the conspicuous lineshape asymmetry of the x = 0.34 compound.Gihyeon AhnJ. L. SchmehrZ. PorterS. D. WilsonS. J. MoonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gihyeon Ahn J. L. Schmehr Z. Porter S. D. Wilson S. J. Moon Doping and temperature evolutions of optical response of Sr3(Ir1-x Ru x )2O7
description	Abstract We report on optical spectroscopic study of the Sr3(Ir1-x Ru x )2O7 system over a wide doping regime. We find that the changes in the electronic structure occur in the limited range of the concentration of Ru ions where the insulator–metal transition occurs. In the insulating regime, the electronic structure associated with the effective total angular momentum J eff = 1/2 Mott state remains robust against Ru doping, indicating the localization of the doped holes. Upon entering the metallic regime, the Mott gap collapses and the Drude-like peak with strange metallic character appears. The evolution of the electronic structure registered in the optical data can be explained in terms of a percolative insulator–metal transition. The phonon spectra display anomalous doping evolution of the lineshapes. While the phonon modes of the compounds deep in the insulating and metallic regimes are almost symmetric, those of the semiconducting compound with x = 0.34 in close proximity to the doping-driven insulator–metal transition show a pronounced asymmetry. The temperature evolution of the phonon modes of the x = 0.34 compound reveals the asymmetry is enhanced in the antiferromagnetic state. We discuss roles of the S = 1 spins of the Ru ions and charge excitations for the conspicuous lineshape asymmetry of the x = 0.34 compound.
format	article
author	Gihyeon Ahn J. L. Schmehr Z. Porter S. D. Wilson S. J. Moon
author_facet	Gihyeon Ahn J. L. Schmehr Z. Porter S. D. Wilson S. J. Moon
author_sort	Gihyeon Ahn
title	Doping and temperature evolutions of optical response of Sr3(Ir1-x Ru x )2O7
title_short	Doping and temperature evolutions of optical response of Sr3(Ir1-x Ru x )2O7
title_full	Doping and temperature evolutions of optical response of Sr3(Ir1-x Ru x )2O7
title_fullStr	Doping and temperature evolutions of optical response of Sr3(Ir1-x Ru x )2O7
title_full_unstemmed	Doping and temperature evolutions of optical response of Sr3(Ir1-x Ru x )2O7
title_sort	doping and temperature evolutions of optical response of sr3(ir1-x ru x )2o7
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/e60d67897ed84be0a728fdf698534db0
work_keys_str_mv	AT gihyeonahn dopingandtemperatureevolutionsofopticalresponseofsr3ir1xrux2o7 AT jlschmehr dopingandtemperatureevolutionsofopticalresponseofsr3ir1xrux2o7 AT zporter dopingandtemperatureevolutionsofopticalresponseofsr3ir1xrux2o7 AT sdwilson dopingandtemperatureevolutionsofopticalresponseofsr3ir1xrux2o7 AT sjmoon dopingandtemperatureevolutionsofopticalresponseofsr3ir1xrux2o7
_version_	1718392828507193344

Doping and temperature evolutions of optical response of Sr3(Ir1-x Ru x )2O7

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