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Direct spectroscopic evidence for mixed-valence TI in the low carrier-density superconductor Pb1-xTIxTe

TitleDirect spectroscopic evidence for mixed-valence TI in the low carrier-density superconductor Pb1-xTIxTe
Publication TypeJournal Article
Year of Publication2018
AuthorsWalmsley, P, Liu, C, Palczewski, AD, Giraldo-Gallo, P, Olson, CG, Fisher, IR, Kaminski, AA
JournalPhysical Review B
Volume98
Pagination184506
Date Published11
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000450261100004
Keywordsband, exciton, impurities, lead-telluride, Materials Science, model, pbte, physics, state, tl
Abstract

e unambiguous observation of multiple valences of Tl in Tl-doped PbTe via photoemission spectroscopy measurements. It is shown via a quantitative analysis that the suppression of the carrier density in compositions exhibiting superconductivity and Kondo-like behavior can be accounted for by mixed valency, thus arguing against a self-compensation scenario proposed elsewhere for this material and strengthening the case for valence fluctuation models. In addition to the identification of Tl(+ )and Tl3+ a possible third intermediate local charge-density is suggested by full fits to the data, the origins of which are also discussed but remain unclear.

DOI10.1103/PhysRevB.98.184506
Custom 1

Complex States

Alternate JournalPhys. Rev. B