Chemical Potential Shift in Overdoped and Underdoped La{sub 2{minus}x}Sr{sub x}CuO{sub 4}
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)
- Department of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)
The downward shift of the electron chemical potential {mu} with hole doping in La{sub 2{minus}x}Sr {sub x}CuO{sub 4} has been deduced from the shifts of photoemission and inverse-photoemission spectra. While the shift is large ({approximately} 1.5eV/hole) in overdoped samples, it is suppressed ({lt}0.2 eV/hole) in underdoped samples, implying a divergent charge susceptibility near the metal-insulator transition. In the overdoped regime, the {mu} and the electronic specific heat coefficient {gamma} are consistently explained within Fermi-liquid theory, whereas the same analysis gives unphysical results in the underdoped regime, indicating the breakdown of the Fermi-liquid picture in the underdoped regime. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 560725
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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