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Science 18 January 2002:
Vol. 295. no. 5554, pp. 466 - 469
DOI: 10.1126/science.1066974
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Reports

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

J. E. Hoffman,1 E. W. Hudson,12* K. M. Lang,1 V. Madhavan,1 H. Eisaki,3dagger S. Uchida,3 J. C. Davis12ddagger

Scanning tunneling microscopy is used to image the additional quasi-particle states generated by quantized vortices in the high critical temperature superconductor Bi2Sr2CaCu2O8+delta . They exhibit a copper-oxygen bond-oriented "checkerboard" pattern, with four unit cell (4a0) periodicity and a ~30 angstrom decay length. These electronic modulations may be related to the magnetic field-induced, 8a0 periodic, 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 lambda  should be associated with a corresponding electronic modulation of wavelength lambda /2, in good agreement with our observations.

1 Department of Physics, University of California, Berkeley, CA 94720-7300, USA.
2 Materials Sciences Division, Lawrence Berkeley National Laboratory. Berkeley, CA 94720, USA.
3 Department of Superconductivity, University of Tokyo, Tokyo 113-8656, Japan.
*   Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA.

dagger    Present address: Department of Applied Physics, Stanford University, Stanford, CA 94305-4060, USA.

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

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