Pseudogap ground state and its doping evolution in Bi 2Sr 2-xLa xCuO 6+δ: Removing the superconducting state by the application of very high magnetic fields

Guo Qing Zheng, S. Kawasaki, C. T. Lin, P. L. Kuhns, A. P. Reyes

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present results for the pseudogap ground state and its doping evolution in single-layered copper-oxide Bi 2Sr 2-xLa xCuO 6+δ. We apply very high magnetic fields up to 44 T to remove the superconducting state and reveal the hidden low temperature (T ) normal state. Through 63Cu- NMR Knight shift and spin-lattice relaxation rate measurements, we find that there remains a finite density of states (DOS) at the Fermi level in the zero-T limit when the superconductivity is removed, which indicates that the pseudogap ground state is a metallic state with a finite volume of Fermi surface. The residual DOS in the pseudogap ground state decreases with decreasing doping (increasing x), but remains quite large even at the vicinity of the magnetically ordered phase of x ≥ 0.8. The result indicates that the superconductivity emerges from the remaining Fermi surface and coexists with the pseudogap.

Original languageEnglish
Pages (from-to)1249-1253
Number of pages5
JournalJournal of Superconductivity and Novel Magnetism
Volume25
Issue number5
DOIs
Publication statusPublished - Jul 1 2012

Keywords

  • High magnetic field
  • Pseudogap
  • Superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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