The electronic structure of Ag1-xSn1+xSe2 (x=0.0, 0.1, 0.2, 0.25 and 1.0)

被引：19

作者：

Wakita, Takanori ^{[1
]}

Paris, Eugenio ^{[2
]}

Kobayashi, Kaya ^{[1
]}

Terashima, Kensei ^{[1
]}

Hacisalihoglu, Muammer Yasin ^{[2
,3
]}

Ueno, Teppei ^{[4
]}

Bondino, Federica ^{[5
]}

Magnano, Elena ^{[5
,7
]}

Pis, Igor ^{[5
,6
]}

Olivi, Luca

Akimitsu, Jun ^{[1
]}

Muraoka, Yuji ^{[1
]}

Yokoya, Takayoshi ^{[1
]}

Saini, Naurang L. ^{[2
]}

机构：

[1] Okayama Univ, Res Inst Interdisciplinary Sci, Okayama 7008530, Japan

[2] Sapienza Univ Roma, Dipartimento Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy

[3] Recep Tayyip Erdogan Univ, Dept Phys, TR-53100 Rize, Turkey

[4] Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan

[5] Lab TASC, IOM CNR, SS 14 Km 163-5, I-34149 Trieste, Italy

[6] Elettra Sincrotrone Trieste, Str Statale 14,Km 163-5, Trieste, Italy

[7] Univ Johannesburg, Dept Phys, POB 524,Auckland Pk, ZA-2006 Johannesburg, South Africa

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2017年 / 19卷 / 39期

基金：

日本学术振兴会;

关键词：

X-RAY-ABSORPTION; SNSE; SUPERCONDUCTIVITY; PHOTOEMISSION; SPECTROSCOPY; PERFORMANCE; TRANSITION; CRYSTALS;

D O I：

10.1039/c7cp05369j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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-delta 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.

引用

页码：26672 / 26678

页数：7

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