Polarized X-Ray Absorption Studies of Oxide Superconductors

1988 ◽  
Vol 143 ◽  
Author(s):  
E. Ercan Alp ◽  
S. M. Mini ◽  
M. Ramanathan ◽  
B. W. Veal ◽  
L. Soderholm ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Oxide Superconductors ◽  
Oxygen Doping ◽  
X Ray ◽  
Cluster Calculations ◽  
Absorption Studies ◽  
X Ray Absorption ◽  
Absorption Edges

AbstractPolarized X-ray absorption studies have been carried out at the Cu K-edge to study the effect of Sr doping in La2CuO4 and oxygen doping in YBa2Cu3O6+x. These measurements help to elucidate the transitions giving rise to the absorption edges. We offer an explanation of the polarization shifts of features in terms of the results of our embedded cluster calculations of electronic structure.

Soft-x-ray-absorption studies of the electronic-structure changes through theVO2phase transition

1991 ◽  
Vol 43 (9) ◽  
pp. 7263-7266 ◽  
Author(s):  
M. Abbate ◽  
F. M. F. de Groot ◽  
J. C. Fuggle ◽  
Y. J. Ma ◽  
C. T. Chen ◽  
...  
Keyword(s):  
Electronic Structure ◽  
X Ray ◽  
Structure Changes ◽  
Absorption Studies ◽  
X Ray Absorption

X-Ray Absorption Studies of La2−xSrxCuO4 and Y1−xPrxBa2Cu3O7-δ

1987 ◽  
Vol 99 ◽  
Author(s):  
E. E. Alp ◽  
G. K. Shenoy ◽  
L. Soderholm ◽  
G. L. Goodman ◽  
D. G. Hinks ◽  
...  
Keyword(s):  
Rare Earth ◽  
Cross Section ◽  
Atomic Clusters ◽  
Oxide Superconductors ◽  
Absorption Cross ◽  
Edge Structure ◽  
X Ray ◽  
Absorption Studies ◽  
High Transition ◽  
X Ray Absorption

ABSTRACTThe question of valence of Cu and rare-earth atoms in the newly discovered oxide superconductors with high transition temperatures is crucial to the understanding of their electronic structure. We have measured the X-Ray Absorption Near Edge Structure (XANES) of Cu K transition and Pr Ljjj transition to obtain information on the valence of Cu, and Pr in La2−xSrxCuO4 and Y1−xPrxBa2Cu3O7-δ. We will present the experimental results, compare them with calculations of absorption cross-section for model atomic clusters, and discuss the valence of Cu as a function of oxygen concentration.

Photoemission and X-ray absorption studies of the electronic structure of GaN-based diluted magnetic semiconductors

2006 ◽  
Vol 243 (7) ◽  
pp. 1696-1700 ◽  
Author(s):  
J. I. Hwang ◽  
Y. Ishida ◽  
M. Kobayashi ◽  
Y. Osafune ◽  
T. Mizokawa ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
X Ray ◽  
Absorption Studies ◽  
Diluted Magnetic ◽  
X Ray Absorption

scholarly journals PHOTOEMISSION AND PHOTOABSORPTION INVESTIGATION OF THE ELECTRONIC STRUCTURE OF YTTERBIUM-DOPED STRONTIUM FLUOROAPATITE

2002 ◽  
Vol 09 (01) ◽  
pp. 387-391 ◽  
Author(s):  
A. J. NELSON ◽  
T. VAN BUUREN ◽  
C. BOSTEDT ◽  
K. I. SCHAFFERS ◽  
LOU TERMINELLO
Keyword(s):  
Electronic Structure ◽  
High Resolution ◽  
Surface Chemistry ◽  
Valence Band ◽  
Absorption Spectroscopy ◽  
Electronic States ◽  
Specific Density ◽  
X Ray ◽  
X Ray Absorption ◽  
Absorption Edges

X-ray photoemission and X-ray photoabsorption were used to study the composition and the electronic structure of ytterbium-doped strontium fluoroapatite (Yb:S-FAP). High resolution photoemission measurements on the valence band electronic structure were used to evaluate the density of occupied states of this fluoroapatite. Element-specific density of unoccupied electronic states in Yb:S-FAP was probed by X-ray absorption spectroscopy (XAS) at the Yb 4d ( N 4,5-edge), Sr 3d ( M 4,5-edge), P 2p ( L 2,3-edge), F 1s and O 1s (K-edges) absorption edges. These results provide the first measurements of the electronic structure and surface chemistry of this material.

In situ X-ray absorption spectroscopy of transition metal based water oxidation catalysts

2017 ◽  
Vol 46 (1) ◽  
pp. 102-125 ◽  
Author(s):  
Christina H. M. van Oversteeg ◽  
Hoang Q. Doan ◽  
Frank M. F. de Groot ◽  
Tanja Cuk
Keyword(s):  
Electronic Structure ◽  
Transition Metal ◽  
Absorption Spectroscopy ◽  
Water Oxidation ◽  
Oxidation Catalysts ◽  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption

X-ray absorption studies of the geometric and electronic structure of primarily heterogeneous Co, Ni, and Mn based water oxidation catalysts are reviewed.

X-ray absorption studies of the electronic structure of nickel-copper catalysts

1992 ◽  
Vol 15 (3) ◽  
pp. 219-229 ◽  
Author(s):  
G. Meitzner ◽  
D. A. Fischer ◽  
J. H. Sinfelt
Keyword(s):  
Electronic Structure ◽  
Copper Catalysts ◽  
X Ray ◽  
Nickel Copper ◽  
Absorption Studies ◽  
X Ray Absorption

Ru L edge x‐ray absorption studies of the electronic structure of Ru3(CO)12 adsorption and the formation of Ru–Cu bimetallics on Cu(111)

1988 ◽  
Vol 88 (1) ◽  
pp. 475-477 ◽  
Author(s):  
T. K. Sham ◽  
T. Ohta ◽  
T. Yokoyama ◽  
Y. Kitajima ◽  
M. Funabashi ◽  
...  
Keyword(s):  
Electronic Structure ◽  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption

Operando X-ray diffraction and X-ray absorption studies of the structural transformation upon cycling excess Li layered oxide Li[Li1/18Co1/6Ni1/3Mn4/9]O2 in Li ion batteries

2015 ◽  
Vol 3 (16) ◽  
pp. 8613-8626 ◽  
Author(s):  
Ching-Hsiang Chen ◽  
Chun-Jern Pan ◽  
Wei-Nien Su ◽  
John Rick ◽  
Chih-Jen Wang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Li Ion Batteries ◽  
X Ray Diffraction ◽  
Lithium Ions ◽  
X Ray ◽  
Oxygen Ions ◽  
Surface Electronic Structure ◽  
Absorption Studies ◽  
Li Ion ◽  
X Ray Absorption

Co helps maintain the lithium ions stably in the transition metal inter slabs and the surface electronic structure of oxygen ions is reversible during cycling between 4.6 V and 2.5 V.

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