Coexistence of superconducting gap and pseudogap in underdoped Bi2212

Kwok Wai Ng, Anjan K. Gupta

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


We have carefully studied the temperature dependence of tunneling spectra in underdoped and slightly overdoped Bi2212 single crystals. The underdoped spectra clearly show a pseudogap above Tc, while this gap features get very weak in slightly overdoped crystals. Without the pseudogap depression, the states in slightly overdoped spectra are always conserved. However, underdoped spectra do not conserve states even at temperatures when the material is in its superconducting state. We found that the conservation of states can be recovered by normalizing the superconducting spectra with the normal state pseudogap spectra. This clearly indicates the coexistence of pseudogap and superconducting gap. As we will show in the analysis section, this coexistence can also explain the hump and dip features commonly observed in tunneling spectra.

Original languageEnglish
Pages (from-to)221-222
Number of pages2
JournalPhysica C: Superconductivity and its Applications
StatePublished - May 2003
Eventproceedings of the 23rd international conference on low temper - Hiroshima, Japan
Duration: Aug 20 2002Aug 27 2002

Bibliographical note

Funding Information:
This work was supported by NSF grant DMR9972071.


  • Density of states
  • High T
  • Pseudogap
  • Tunneling

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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