| Issue |
Europhys. Lett.
Volume 58, Number 6, June 2002
|
|
|---|---|---|
| Page(s) | 878 - 884 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00456-2 | |
| Published online | 01 June 2002 | |
Non-conservation of density of states in
y:
Coexistence of pseudogap and superconducting gap
Department of Physics and Astronomy, University of Kentucky
Lexington, KY 40506-0055, USA
Received:
6
August
2001
Accepted:
25
March
2002
The tunneling spectra obtained within the (a,b)-plane of
y (Bi2212) for temperatures below and
above the critical temperature 
are analyzed.
We find that the tunneling conductance spectra for the underdoped
compound in the superconducting state do not follow the conservation
of states rule. There is a consistent loss of states for the
underdoped Bi2212 implying an underlying depression
in the density of states (DOS) and hence the pseudogap near the Fermi
energy 
. Such an underlying depression can also explain
the peak-dip-hump structure observed in the spectra.
Furthermore, the conservation of states is recovered and the dip-hump
structure disappears after normalizing the low-temperature spectra
with that of the normal state. We argue that this is a direct evidence
for the coexistence of a pseudogap with the superconducting gap.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.25.Jb – Electronic structure / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states
© EDP Sciences, 2002
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