Phase stability and electronic structure of iridium metal at the megabar range

Abstract The 5d transition metals have attracted specific interest for high-pressure studies due to their extraordinary stability and intriguing electronic properties. In particular, iridium metal has been proposed to exhibit a recently discovered pressure-induced electronic transition, the so-calle...

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Autores principales:	V. Monteseguro, J. A. Sans, V. Cuartero, F. Cova, Igor A. Abrikosov, W. Olovsson, C. Popescu, S. Pascarelli, G. Garbarino, H. Johan M. Jönsson, T. Irifune, D. Errandonea
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/add0a377692f4935bacdcd3283054e81
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spelling	oai:doaj.org-article:add0a377692f4935bacdcd3283054e812021-12-02T15:09:15ZPhase stability and electronic structure of iridium metal at the megabar range10.1038/s41598-019-45401-x2045-2322https://doaj.org/article/add0a377692f4935bacdcd3283054e812019-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-45401-xhttps://doaj.org/toc/2045-2322Abstract The 5d transition metals have attracted specific interest for high-pressure studies due to their extraordinary stability and intriguing electronic properties. In particular, iridium metal has been proposed to exhibit a recently discovered pressure-induced electronic transition, the so-called core-level crossing transition at the lowest pressure among all the 5d transition metals. Here, we report an experimental structural characterization of iridium by x-ray probes sensitive to both long- and short-range order in matter. Synchrotron-based powder x-ray diffraction results highlight a large stability range (up to 1.4 Mbar) of the low-pressure phase. The compressibility behaviour was characterized by an accurate determination of the pressure-volume equation of state, with a bulk modulus of 339(3) GPa and its derivative of 5.3(1). X-ray absorption spectroscopy, which probes the local structure and the empty density of electronic states above the Fermi level, was also utilized. The remarkable agreement observed between experimental and calculated spectra validates the reliability of theoretical predictions of the pressure dependence of the electronic structure of iridium in the studied interval of compressions.V. MonteseguroJ. A. SansV. CuarteroF. CovaIgor A. AbrikosovW. OlovssonC. PopescuS. PascarelliG. GarbarinoH. Johan M. JönssonT. IrifuneD. ErrandoneaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-9 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q V. Monteseguro J. A. Sans V. Cuartero F. Cova Igor A. Abrikosov W. Olovsson C. Popescu S. Pascarelli G. Garbarino H. Johan M. Jönsson T. Irifune D. Errandonea Phase stability and electronic structure of iridium metal at the megabar range
description	Abstract The 5d transition metals have attracted specific interest for high-pressure studies due to their extraordinary stability and intriguing electronic properties. In particular, iridium metal has been proposed to exhibit a recently discovered pressure-induced electronic transition, the so-called core-level crossing transition at the lowest pressure among all the 5d transition metals. Here, we report an experimental structural characterization of iridium by x-ray probes sensitive to both long- and short-range order in matter. Synchrotron-based powder x-ray diffraction results highlight a large stability range (up to 1.4 Mbar) of the low-pressure phase. The compressibility behaviour was characterized by an accurate determination of the pressure-volume equation of state, with a bulk modulus of 339(3) GPa and its derivative of 5.3(1). X-ray absorption spectroscopy, which probes the local structure and the empty density of electronic states above the Fermi level, was also utilized. The remarkable agreement observed between experimental and calculated spectra validates the reliability of theoretical predictions of the pressure dependence of the electronic structure of iridium in the studied interval of compressions.
format	article
author	V. Monteseguro J. A. Sans V. Cuartero F. Cova Igor A. Abrikosov W. Olovsson C. Popescu S. Pascarelli G. Garbarino H. Johan M. Jönsson T. Irifune D. Errandonea
author_facet	V. Monteseguro J. A. Sans V. Cuartero F. Cova Igor A. Abrikosov W. Olovsson C. Popescu S. Pascarelli G. Garbarino H. Johan M. Jönsson T. Irifune D. Errandonea
author_sort	V. Monteseguro
title	Phase stability and electronic structure of iridium metal at the megabar range
title_short	Phase stability and electronic structure of iridium metal at the megabar range
title_full	Phase stability and electronic structure of iridium metal at the megabar range
title_fullStr	Phase stability and electronic structure of iridium metal at the megabar range
title_full_unstemmed	Phase stability and electronic structure of iridium metal at the megabar range
title_sort	phase stability and electronic structure of iridium metal at the megabar range
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/add0a377692f4935bacdcd3283054e81
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Phase stability and electronic structure of iridium metal at the megabar range

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