Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission

Abstract Ag5Pb2O6 has attracted attentions due to its novel nearly-free-electron superconductivity, but its electronic structure and orbital character of the Cooper-pair electrons remain controversial. Here, we present a method utilizing core-level photoemission to show that Pb 6s electrons dominate...

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Autores principales:	Soobin Sinn, Kyung Dong Lee, Choong Jae Won, Ji Seop Oh, Moonsup Han, Young Jun Chang, Namjung Hur, Byeong-Gyu Park, Changyoung Kim, Hyeong-Do Kim, Tae Won Noh
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/67d8a8d5a452438084790cfb34472f85
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spelling	oai:doaj.org-article:67d8a8d5a452438084790cfb34472f852021-12-02T12:31:51ZElement-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission10.1038/s41598-017-04667-92045-2322https://doaj.org/article/67d8a8d5a452438084790cfb34472f852017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04667-9https://doaj.org/toc/2045-2322Abstract Ag5Pb2O6 has attracted attentions due to its novel nearly-free-electron superconductivity, but its electronic structure and orbital character of the Cooper-pair electrons remain controversial. Here, we present a method utilizing core-level photoemission to show that Pb 6s electrons dominate near the Fermi level. We observe a strongly asymmetric Pb 4 f 7/2 core-level spectrum, while a Ag 3d 5/2 spectrum is well explained by two symmetric peaks. The asymmetry in the Pb 4 f 7/2 spectrum originates from the local attractive interaction between conducting Pb 6s electrons and a Pb 4 f 7/2 core hole, which implies a dominant Pb 6s contribution to the metallic conduction. In addition, the observed Pb 4 f 7/2 spectrum is not explained by the well-known Doniach-Šunjić lineshape for a simple metal. The spectrum is successfully generated by employing a Pb 6s partial density of states from local density approximation calculations, thus confirming the Pb 6s dominant character and free-electron-like density of states of Ag5Pb2O6.Soobin SinnKyung Dong LeeChoong Jae WonJi Seop OhMoonsup HanYoung Jun ChangNamjung HurByeong-Gyu ParkChangyoung KimHyeong-Do KimTae Won NohNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Soobin Sinn Kyung Dong Lee Choong Jae Won Ji Seop Oh Moonsup Han Young Jun Chang Namjung Hur Byeong-Gyu Park Changyoung Kim Hyeong-Do Kim Tae Won Noh Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission
description	Abstract Ag5Pb2O6 has attracted attentions due to its novel nearly-free-electron superconductivity, but its electronic structure and orbital character of the Cooper-pair electrons remain controversial. Here, we present a method utilizing core-level photoemission to show that Pb 6s electrons dominate near the Fermi level. We observe a strongly asymmetric Pb 4 f 7/2 core-level spectrum, while a Ag 3d 5/2 spectrum is well explained by two symmetric peaks. The asymmetry in the Pb 4 f 7/2 spectrum originates from the local attractive interaction between conducting Pb 6s electrons and a Pb 4 f 7/2 core hole, which implies a dominant Pb 6s contribution to the metallic conduction. In addition, the observed Pb 4 f 7/2 spectrum is not explained by the well-known Doniach-Šunjić lineshape for a simple metal. The spectrum is successfully generated by employing a Pb 6s partial density of states from local density approximation calculations, thus confirming the Pb 6s dominant character and free-electron-like density of states of Ag5Pb2O6.
format	article
author	Soobin Sinn Kyung Dong Lee Choong Jae Won Ji Seop Oh Moonsup Han Young Jun Chang Namjung Hur Byeong-Gyu Park Changyoung Kim Hyeong-Do Kim Tae Won Noh
author_facet	Soobin Sinn Kyung Dong Lee Choong Jae Won Ji Seop Oh Moonsup Han Young Jun Chang Namjung Hur Byeong-Gyu Park Changyoung Kim Hyeong-Do Kim Tae Won Noh
author_sort	Soobin Sinn
title	Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission
title_short	Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission
title_full	Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission
title_fullStr	Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission
title_full_unstemmed	Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission
title_sort	element-specific orbital character in a nearly-free-electron superconductor ag5pb2o6 revealed by core-level photoemission
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/67d8a8d5a452438084790cfb34472f85
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Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor Ag5Pb2O6 Revealed by Core-Level Photoemission

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