The electronic structure of Ag1-: XSn1+ xSe2 (x = 0.0, 0.1, 0.2, 0.25 and 1.0)

Takanori Wakita; Eugenio Paris; Kaya Kobayashi; Kensei Terashima; Muammer Yasin Hacisalihoǧlu; Teppei Ueno; Federica Bondino; Elena Magnano; Igor Píš; Luca Olivi; Jun Akimitsu; Yuji Muraoka; Takayoshi Yokoya; Naurang L. Saini

doi:10.1039/c7cp05369j

The electronic structure of Ag_{1-: X}Sn_{1+ x}Se₂ (x = 0.0, 0.1, 0.2, 0.25 and 1.0)

Takanori Wakita, Eugenio Paris, Kaya Kobayashi, Kensei Terashima, Muammer Yasin Hacisalihoǧlu, Teppei Ueno, Federica Bondino, Elena Magnano, Igor Píš, Luca Olivi, Jun Akimitsu, Yuji Muraoka, Takayoshi Yokoya, Naurang L. Saini

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Abstract

We have studied the valence electronic structure of Ag_1-xSn_1+xSe₂ (x = 0.0, 0.1, 0.2, 0.25) and SnSe (x = 1.0) by a combined analysis of X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscopy (XPS) measurements. Both XAS and XPS reveal an increase in electron carriers in the system with x (i.e. excess Sn concentration) for 0 ≤ x ≤ 0.25. The core-level spectra (Sn 3d, Ag 3d and Se 3d) show that the charge state of Ag is almost 1+, while that of of Sn splits into Sn²⁺ and Sn⁴⁺ (providing clear evidence of valence skipping for the first time) with a concomitant splitting of Se into Se^2- and Se^2-δ states. The x dependence of the split components in Sn and Se together with the Se-K edge XAS reveals that the Se valence state may have an essential role in the transport properties of this system.

Original language	English
Pages (from-to)	26672-26678
Number of pages	7
Journal	Physical Chemistry Chemical Physics
Volume	19
Issue number	39
DOIs	https://doi.org/10.1039/c7cp05369j
Publication status	Published - 2017

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1039/c7cp05369j

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The electronic structure of Ag_{1-: X}Sn_{1+ x}Se₂ (x = 0.0, 0.1, 0.2, 0.25 and 1.0). / Wakita, Takanori; Paris, Eugenio; Kobayashi, Kaya; Terashima, Kensei; Hacisalihoǧlu, Muammer Yasin; Ueno, Teppei; Bondino, Federica; Magnano, Elena; Píš, Igor; Olivi, Luca; Akimitsu, Jun ; Muraoka, Yuji ; Yokoya, Takayoshi; Saini, Naurang L.

In: Physical Chemistry Chemical Physics, Vol. 19, No. 39, 2017, p. 26672-26678.

Research output: Contribution to journal › Article › peer-review

Wakita, Takanori ; Paris, Eugenio ; Kobayashi, Kaya ; Terashima, Kensei ; Hacisalihoǧlu, Muammer Yasin ; Ueno, Teppei ; Bondino, Federica ; Magnano, Elena ; Píš, Igor ; Olivi, Luca ; Akimitsu, Jun ; Muraoka, Yuji ; Yokoya, Takayoshi ; Saini, Naurang L. / The electronic structure of Ag_{1-: X}Sn_{1+ x}Se₂ (x = 0.0, 0.1, 0.2, 0.25 and 1.0). In: Physical Chemistry Chemical Physics. 2017 ; Vol. 19, No. 39. pp. 26672-26678.

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title = "The electronic structure of Ag1-: XSn1+ xSe2 (x = 0.0, 0.1, 0.2, 0.25 and 1.0)",

abstract = "We have studied the valence electronic structure of Ag1-xSn1+xSe2 (x = 0.0, 0.1, 0.2, 0.25) and SnSe (x = 1.0) by a combined analysis of X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscopy (XPS) measurements. Both XAS and XPS reveal an increase in electron carriers in the system with x (i.e. excess Sn concentration) for 0 ≤ x ≤ 0.25. The core-level spectra (Sn 3d, Ag 3d and Se 3d) show that the charge state of Ag is almost 1+, while that of of Sn splits into Sn2+ and Sn4+ (providing clear evidence of valence skipping for the first time) with a concomitant splitting of Se into Se2- and Se2-δ states. The x dependence of the split components in Sn and Se together with the Se-K edge XAS reveals that the Se valence state may have an essential role in the transport properties of this system.",

author = "Takanori Wakita and Eugenio Paris and Kaya Kobayashi and Kensei Terashima and Hacisalihoǧlu, {Muammer Yasin} and Teppei Ueno and Federica Bondino and Elena Magnano and Igor P{\'i}{\v s} and Luca Olivi and Jun Akimitsu and Yuji Muraoka and Takayoshi Yokoya and Saini, {Naurang L.}",

note = "Funding Information: We thank Elettra staff for the assistance during the measurements. Two of us (T. W. & K. T.) would like to acknowledge hospitality at the Sapienza University of Rome. One of us (M. Y. H.) would like to thank Sapienza University for the hospitality and TUBITAK BIDEB foundation for the fellowship. This research was partially supported by the Program for Promoting the Enhancement of Research University from MEXT and the Program for Advancing Strategic International Networks to Accelerate the Circulation of Talented Researchers from JSPS (R2705). The support from the Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (15H03691, 25000003, 15K13524, 26247057 and 15H05886), is acknowledged. The work is a part of the executive protocol of the general agreement for cooperation between the Sapienza University of Rome and the Okayama University, Japan. The work at Sapienza is partially supported by PRIN2012 (grant number 2012X3YFZ2) of MIUR, Italy. Publisher Copyright: {\textcopyright} 2017 the Owner Societies.",

year = "2017",

doi = "10.1039/c7cp05369j",

language = "English",

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pages = "26672--26678",

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T1 - The electronic structure of Ag1-: XSn1+ xSe2 (x = 0.0, 0.1, 0.2, 0.25 and 1.0)

AU - Wakita, Takanori

AU - Paris, Eugenio

AU - Kobayashi, Kaya

AU - Terashima, Kensei

AU - Hacisalihoǧlu, Muammer Yasin

AU - Ueno, Teppei

AU - Bondino, Federica

AU - Magnano, Elena

AU - Píš, Igor

AU - Olivi, Luca

AU - Akimitsu, Jun

AU - Muraoka, Yuji

AU - Yokoya, Takayoshi

AU - Saini, Naurang L.

N1 - Funding Information: We thank Elettra staff for the assistance during the measurements. Two of us (T. W. & K. T.) would like to acknowledge hospitality at the Sapienza University of Rome. One of us (M. Y. H.) would like to thank Sapienza University for the hospitality and TUBITAK BIDEB foundation for the fellowship. This research was partially supported by the Program for Promoting the Enhancement of Research University from MEXT and the Program for Advancing Strategic International Networks to Accelerate the Circulation of Talented Researchers from JSPS (R2705). The support from the Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (15H03691, 25000003, 15K13524, 26247057 and 15H05886), is acknowledged. The work is a part of the executive protocol of the general agreement for cooperation between the Sapienza University of Rome and the Okayama University, Japan. The work at Sapienza is partially supported by PRIN2012 (grant number 2012X3YFZ2) of MIUR, Italy. Publisher Copyright: © 2017 the Owner Societies.

PY - 2017

Y1 - 2017

N2 - We have studied the valence electronic structure of Ag1-xSn1+xSe2 (x = 0.0, 0.1, 0.2, 0.25) and SnSe (x = 1.0) by a combined analysis of X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscopy (XPS) measurements. Both XAS and XPS reveal an increase in electron carriers in the system with x (i.e. excess Sn concentration) for 0 ≤ x ≤ 0.25. The core-level spectra (Sn 3d, Ag 3d and Se 3d) show that the charge state of Ag is almost 1+, while that of of Sn splits into Sn2+ and Sn4+ (providing clear evidence of valence skipping for the first time) with a concomitant splitting of Se into Se2- and Se2-δ states. The x dependence of the split components in Sn and Se together with the Se-K edge XAS reveals that the Se valence state may have an essential role in the transport properties of this system.

AB - We have studied the valence electronic structure of Ag1-xSn1+xSe2 (x = 0.0, 0.1, 0.2, 0.25) and SnSe (x = 1.0) by a combined analysis of X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscopy (XPS) measurements. Both XAS and XPS reveal an increase in electron carriers in the system with x (i.e. excess Sn concentration) for 0 ≤ x ≤ 0.25. The core-level spectra (Sn 3d, Ag 3d and Se 3d) show that the charge state of Ag is almost 1+, while that of of Sn splits into Sn2+ and Sn4+ (providing clear evidence of valence skipping for the first time) with a concomitant splitting of Se into Se2- and Se2-δ states. The x dependence of the split components in Sn and Se together with the Se-K edge XAS reveals that the Se valence state may have an essential role in the transport properties of this system.

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JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

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ER -

The electronic structure of Ag_{1-: X}Sn_{1+ x}Se₂ (x = 0.0, 0.1, 0.2, 0.25 and 1.0)

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