Gap distributions and spatial variation of electronic states in superconducting and pseudogap states of Bi2Sr2Ca2CuO8+δ

K. K. Gomes, A. Pasupathy, A. Pushp, S. Ono, Y. Ando, A. Yazdani

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

High-resolution scanning tunneling microscopy has been used to study the tunneling density of states in lightly underdoped samples of the high-Tc superconductor Bi2Sr2Ca2CuO8+δ in both the superconducting and pseudogap states. We demonstrate that the tunneling gaps observed in these two states have identical spatial distributions and correlation lengths. This observation suggests that the two gaps, and hence the two phenomena, cannot have a competing origin. In addition, we present measurements that show that in contrast to the superconducting state, in which low energy quasi-particles are homogenous in real space, the states near the Fermi level are spatially inhomogeneous in the pseudogap state. The variation of the low-energy electronic states is spatially correlated with local changes in the pseudogap.

Original languageEnglish (US)
Pages (from-to)212-215
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume460-462 I
Issue numberSPEC. ISS.
DOIs
StatePublished - Sep 1 2007

All Science Journal Classification (ASJC) codes

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

Keywords

  • High T
  • STM
  • Superconductivity
  • Tunneling

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