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arxiv: cond-mat/0201348 · v1 · submitted 2002-01-19 · ❄️ cond-mat.supr-con

A Four-Unit-Cell Periodic Pattern of Quasiparticle States Surrounding Vortex Cores in Bi2Sr2CaCu2O8+d

J. E. Hoffman (1) , E. W. Hudson (1 , 2) , K. M. Lang (1) , V. Madhavan (1) , H. Eisaki (3) , S. Uchida (3) & J.C. Davis (1 , 2) ((1) University of California
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Berkeley CA USA. (2) Materials Sciences Division Lawrence Berkeley National Laboratory USA. (3) Dept. of Superconductivity University of Tokyo Japan.)
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classification ❄️ cond-mat.supr-con
keywords spinbi2sr2cacu2o8decaydensityelectroniclengthlocalizedmodulation
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Scanning tunneling microscopy is used to image the additional quasiparticle states generated by quantized vortices in the high-Tc superconductor Bi2Sr2CaCu2O8+d. They exhibit a Cu-O 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 of decay length ~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 L should be associated with a corresponding electronic modulation of wavelength L/2, in good agreement with our observations.

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