Temperature, doping, and polarization effects on Bi 6p and S 3p states in the BiS2-layered superconductor LaO1-xFxBiS2

被引：4

作者：

Chin, Y. Y. ^{[1
]}

Lin, H. -J. ^{[1
]}

Hu, Z. ^{[2
]}

Nagao, Masanori ^{[3
,4
]}

Du, Yongping ^{[5
,6
]}

Wan, Xiangang ^{[5
,6
]}

Su, B. -J. ^{[1
]}

Jang, L. Y. ^{[1
]}

Chan, T. S. ^{[1
]}

Chen, H. -Y. ^{[1
]}

Soo, Y. L. ^{[7
]}

Chen, C. T. ^{[1
]}

机构：

[1] Natl Synchrotron Radiat Res Ctr, 101 Hsin Ann Rd, Hsinchu 30076, Taiwan

[2] Max Planck Inst Chem Phys Fester Stoffe, Nothnitzer Str 40, D-01187 Dresden, Germany

[3] Univ Yamanashi, Ctr Crystal Sci & Technol, 7-32 Miyamae, Kofu, Yamanashi 4008511, Japan

[4] Natl Inst Mat Sci, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

[5] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

[6] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[7] Natl Tsing Hua Univ, Dept Phys, 101,Sect 2,Kuang Fu Rd, Hsinchu 30013, Taiwan

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 03期

关键词：

ELECTRONIC STATES; T-C; PLANE; FUNCTIONALS; ANISOTROPY; PRESSURE; HOLES;

D O I：

10.1103/PhysRevB.94.035150

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The x-ray absorption spectra at the Bi-L-1 and S-K edges of LaO1-xFxBiS2 show a decrease of spectral weight close to the absorption thresholds upon F substitution for O, indicating a reduction of the unoccupied Bi 6p and S 3p states, as expected for electron doping. This doping-induced spectral weight transfer at the S-K edge is similar to the electron-doped cuprate superconductor, Nd2-xCexCuO4, but the polarization-dependent XAS spectra of LaO0.54F0.46BiS2 at the S-K edge is very different from those of Nd2-xCexCuO4 at the O-K edge, reflecting different constitution of valence electrons. We found that one-electron band structure calculations cannot describe our experimental S-K XAS spectra of LaO1-xFxBiS2, suggesting possible correlation effects for p electrons, which is important in transition metal compounds with the dominating d electrons.

引用

页数：7

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