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Phase stability and electronic structure of iridium metal at the megabar range
Univ Valencia, Spain; European Radiat Synchrotron Facil, France.
Univ Politecn Valencia, Spain.
European Radiat Synchrotron Facil, France; Ctr Univ Def Zaragoza, Spain.
European Radiat Synchrotron Facil, France.
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 8940Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019. Vol. 9, article id 8940
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-158862DOI: 10.1038/s41598-019-45401-xISI: 000472137700036PubMedID: 31222067Scopus ID: 2-s2.0-85067628529OAI: oai:DiVA.org:liu-158862DiVA, id: diva2:1337601
Note

Funding Agencies|Spanish Ministry of Science, Innovation and Universities; Spanish Research Agency (AEI); European Fund for Regional Development (FEDER) [MAT2016-75586-C4-1/2-P]; Generalitat Valenciana [Prometeo/2018/123]; Spanish Mineco Project [FIS2017-83295-P]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]; Ministry of Science and High Education of the Russian Federation [K2-2019-001]; "Juan de la Cierva" fellowship [FJCI-2016-27921]; "Ramon y Cajal" fellowship [RYC-2015-17482]

Available from: 2019-07-16 Created: 2019-07-16 Last updated: 2019-11-07Bibliographically approved

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