Report

A Four Unit Cell Periodic Pattern of Quasi-Particle States Surrounding Vortex Cores in Bi2Sr2CaCu2O8+δ

See allHide authors and affiliations

Science  18 Jan 2002:
Vol. 295, Issue 5554, pp. 466-469
DOI: 10.1126/science.1066974

You are currently viewing the abstract.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Abstract

Scanning tunneling microscopy is used to image the additional quasi-particle states generated by quantized vortices in the high critical temperature superconductor Bi2Sr2CaCu2O8+δ. They exhibit a copper-oxygen bond–oriented “checkerboard” pattern, with four unit cell (4a 0) periodicity and a ∼30 angstrom decay length. These electronic modulations may be related to the magnetic field–induced, 8a 0periodic, spin density modulations with decay length of ∼70 angstroms recently discovered in La1.84Sr0.16CuO4. The proposed explanation is a spin density wave localized surrounding each vortex core. General theoretical principles predict that, in the cuprates, a localized spin modulation of wavelength λ should be associated with a corresponding electronic modulation of wavelength λ/2, in good agreement with our observations.

  • * Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139–4307, USA.

  • Present address: Department of Applied Physics, Stanford University, Stanford, CA 94305–4060, USA.

  • To whom correspondence should be addressed. E-mail: jcdavis{at}socrates.berkeley.edu

View Full Text