Photoemission Broadening of Fermi-Liquid Systems, and Its Relevance to High-Temperature Superconductors

We measured at high energy and angular resolution the spectral width of photoemission features near the Fermi energy for Ag(100) and for the nearly-two-dimensional metal 2H-NbSe2. The results do not agree with the quadratic width-energy relationship predicted for the lifetime broadening of a Fermi liquid: We found a nearly inverse linear relationship for the sp band of Ag(100), and a similar behavior in the case of NbSe2. These results indicate that the broadening is primarily affected by extrinsic factors rather than by the lifetime-and also that the "anomalous" broadening of the photoemission spectra found for the normal state of the high-temperature superconductors cannot be automatically interpreted as evidence of non-Fermi-liquid behavior.


Published in:
Physical Review B, 45, 10, 5438-5442
Year:
1992
ISSN:
0163-1829
Keywords:
Note:
Ecole polytech fed lausanne,inst phys appl,ch-1015 lausanne,switzerland. Hwu, y, univ wisconsin,dept phys,madison,wi 53706.
ISI Document Delivery No.: HJ689
Laboratories:




 Record created 2006-10-03, last modified 2018-03-18


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