O 1s x-ray absorption spectroscopy of Tl2Ba2Ca3O10 high-TC superconductors

1991 ◽  
Author(s):  
A. Krol ◽  
C. S. Lin ◽  
Y. L. Soo ◽  
Z. H. Ming ◽  
Y. H. Kao ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
High Tc Superconductors ◽  
High Tc ◽  
X Ray ◽  
X Ray Absorption

Valence characterization and in-situ kinetics of oxygen uptake and removal in high Tc superconductors by X-ray absorption spectroscopy

1989 ◽  
Vol 148 (1-2) ◽  
pp. 97-108 ◽  
Author(s):  
A. Fontaine ◽  
A.M. Flank ◽  
E. Dartyge ◽  
P. Lagarde ◽  
H. Tolentino ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Absorption Spectroscopy ◽  
High Tc Superconductors ◽  
High Tc ◽  
X Ray ◽  
X Ray Absorption ◽  
Kinetics Of

Studies of Microstructures in High-Tc Superconductors by X-ray Absorption Techniques

1990 ◽  
pp. 281-284
Author(s):  
A. Krol ◽  
C. J. Sher ◽  
Z. H. Ming ◽  
C. S. Lin ◽  
L. W. Song ◽  
...  
Keyword(s):  
High Tc Superconductors ◽  
High Tc ◽  
X Ray ◽  
X Ray Absorption

VALENCE STATES AND LOCAL ENVIRONMENT OF THALLIUM AND COPPER IONS IN SOME NEW HIGH Tc SUPERCONDUCTORS BY XAS

1989 ◽  
Vol 03 (07) ◽  
pp. 1085-1096 ◽  
Author(s):  
F. STUDER ◽  
R. RETOUX ◽  
C. MARTIN ◽  
C. MICHEL ◽  
B. RAVEAU ◽  
...  
Keyword(s):  
Valence State ◽  
Copper Ions ◽  
Local Environment ◽  
X Ray Diffraction ◽  
High Tc Superconductors ◽  
High Tc ◽  
X Ray ◽  
Valence States ◽  
X Ray Absorption ◽  
Thallium Ions

The valence states of cations inside four high T c thallium superconductors have been investigated by X-ray absorption spectroscopy at thallium LIII , LI and copper K-edges. The thallium ions are observed on LIII and LI edges in the Tl(III) valence state (empty 6s levels) in spite of large Tl-O distances in the (a, b) plane of the structure as deduced from X-ray diffraction. The presence of two types of Tl-O distances have been well established on XANES spectra and the F.T. of EXAFS have shown the presence of two very short Tl-O bonds (2.03 Å). The copper K-edges are characterized by the absence of Cu(I) state (3d10 line).

Study on copper valency of high-tc superconductor YBa2Cu3O7−y by high temperature X-ray absorption spectroscopy

1988 ◽  
Vol 65 (3) ◽  
pp. 213-217 ◽  
Author(s):  
Toshiaki Iwazumi ◽  
Izumi Nakai ◽  
Mitsuru Izumi ◽  
Hiroyuki Oyanagi ◽  
Hideaki Sawada ◽  
...  
Keyword(s):  
High Temperature ◽  
Absorption Spectroscopy ◽  
High Tc ◽  
X Ray ◽  
High Tc Superconductor ◽  
X Ray Absorption

X-ray absorption studies of La2-x(Ba,Sr)xCuO4 high-Tc superconductors

1993 ◽  
Vol 209 (4) ◽  
pp. 373-380 ◽  
Author(s):  
M.J. Akhtar ◽  
Z.N. Akhtar ◽  
C.R.A. Catlow
Keyword(s):  
High Tc Superconductors ◽  
High Tc ◽  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption

SYMMETRY OF THE HOLE STATES IN BiCaSrCuO HIGH-Tc SUPERCONDUCTORS

1988 ◽  
Vol 02 (11n12) ◽  
pp. 1313-1318 ◽  
Author(s):  
A. BIANCONI ◽  
P. CASTRUCCI ◽  
M. DE SANTIS ◽  
A. DI CICCO ◽  
A. FABRIZI ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Ground State ◽  
Superconducting Materials ◽  
Molecular Symmetry ◽  
High Tc Superconductors ◽  
High Tc ◽  
X Ray ◽  
Oriented Film ◽  
X Ray Absorption

Polarized Cu L3-edge X-ray absorption spectra (XAS) of oriented film of Bi 2 Sr 2 Ca 1 Cu 2 O y have been measured to determine the symmetry of the orbital of the electronic holes. The states with the configuration 3d9L (L indicates ligand holes) have been detected. The holes d in superconducting materials are found to be in the antiferromagnetic band with b1 symmetry, derived by the Cu 3dx2 - y2 orbital, but also in a second band with a1 molecular symmetry, derived by Cu 3dz2 - r2 orbital at the Cu site. Our results can be rationalized with the formation of both d (b1) L and d (a1) L states in the ground state of this high-T c superconductor.

scholarly journals Ultra-Soft X-Ray Absorption Spectroscopy: A Bulk and Surface Probe of Materials

1993 ◽  
Vol 307 ◽  
Author(s):  
Daniel A. Fischer ◽  
Gary E. Mitchell ◽  
Benjamin M. Dekoven ◽  
Alvin T. Yeh ◽  
John L. Gland ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Polymeric Materials ◽  
Fluorescence Yield ◽  
State Density ◽  
Hole State ◽  
High Tc ◽  
X Ray ◽  
Surface Probe ◽  
Depth Sensitivity ◽  
X Ray Absorption

ABSTRACTDirect comparisons between the surface and bulk of diverse materials can be made by simultaneous electron yield (5 nm depth sensitivity) and fluorescence yield (200 nm) ultra soft x-ray absorption spectroscopy measurements utilizing a rapid sample interchange apparatus. For example the orientations of functional groups have been characterized at and near the surface of a series of model polymeric materials highlighting the chemical and molecular sensitivity of ultra soft x-ray absorption spectroscopy. In addition we discuss a bulk sensitive use of fluorescence yield to non destructively study a buried metal polymer interface. A second bulk sensitive example is the use of fluorescence yield oxygen K near edge x-ray spectroscopy as a method to determine the hole state density of high Tc materials.

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