Angle resolved photoemission spectra of high-Tc superconductors: A Fermi-liquid based analysis

1991 ◽  
Author(s):  
Hayoung Kim ◽  
Peter S. Riseborough
Keyword(s):  
Fermi Liquid ◽  
High Tc Superconductors ◽  
High Tc

Electronic Picture in the Normal States of High-Tc Superconductors: From the Optical Viewpoint

1989 ◽  
Vol 156 ◽  
Author(s):  
S. Tajima
Keyword(s):  
Liquid Metal ◽  
Frequency Spectrum ◽  
High Frequency ◽  
Fermi Liquid ◽  
Low Frequency ◽  
High Tc Superconductors ◽  
High Tc ◽  
Electronic Model ◽  
Normal States ◽  
Highly Correlated

ABSTRACTThe specific features of the optical spectra in the high-Tc Cu-oxides are discussed. The low-frequency spectral behavior can be explained by the highly correlated electronic model, whereas in the high-frequency spectrum the behavior of the Fermi liquid metal shows up.

The many faces of STEM in materials science

1991 ◽  
Vol 49 ◽  
pp. 440-441
Author(s):  
John Silcox
Keyword(s):  
Materials Science ◽  
Auger Spectroscopy ◽  
Dark Field ◽  
High Tc Superconductors ◽  
High Tc ◽  
Acoustic Environment ◽  
Electromagnetic Vibration ◽  
The Many ◽  
Serial Mode

Determination of the microstructure and microchemistry of small features often provides the insight needed for the understanding of processes in real materials. In many cases, it is not adequate to use microscopy alone. Microdiffraction and microspectroscopic information such as EELS, X-ray microprobe analysis and Auger spectroscopy can all contribute vital parts of the picture. For a number of reasons, dedicated STEM offers considerable promise as a quantitative instrument. In this paper, we review progress towards effective quantitative use of STEM with illustrations drawn from studies of high Tc superconductors, compound semiconductors and metallization of H-terminated silicon.Intrinsically, STEM is a quantitative instrument. Images are acquired directly by detectors in serial mode which is particularly convenient for digital image acquisition, control and display. The VG HB501A at Cornell has been installed in a particularly stable electromagnetic, vibration and acoustic environment. Care has been paid to achieving UHV conditions (i.e., 10-10 Torr). Finally, it has been interfaced with a VAX 3200 work station by Kirkland. This permits, for example, the acquisition of bright field (or energy loss) images and dark field images simultaneously as quantitative arrays in perfect registration.

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