Phenomenology of the low-energy spectral function in high-T{sub c} superconductors
- Materials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Tata Institute of Fundamental Research, Mumbai 400005 (India)
We introduce a simple phenomenological form for the self-energy which allows us to extract important information from angle-resolved photoemission data on the high-T{sub c} superconductor Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} for binding energies of order the spectral gap. First, we find a rapid suppression of the single particle scattering rate below T{sub c} for {ital all} doping levels. Second, we find that in the overdoped materials the gap {Delta} at all {bold k} points on the Fermi surface has significant temperature dependence and vanishes near T{sub c}. In contrast, in the underdoped samples such behavior is found only at {bold k} points close to the diagonal. Near ({pi},0), {Delta} is essentially T independent in the underdoped samples. The filling-in of the pseudogap with increasing T is described by a broadening proportional to T{minus}T{sub c}, which is naturally explained by pairing correlations above T{sub c}. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 603128
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 57; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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