Fourfold structure of vortex-core states in Bi2Sr2CaCu2O8+δ

We present a detailed study of vortex-core spectroscopy in slightly overdoped Bi2Sr2CaCu2O8+delta using a low-temperature scanning tunneling microscope. Inside the vortex core, we observe a fourfold symmetric modulation of the local density of states with an energy-independent period of (4.3 +/- 0.3...

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Bibliographic Details
Published in:Physical review letters 2005-12, Vol.95 (25), p.257005.1-257005.4
Main Authors: LEVY, Giorgio, KUGLER, Martin, MANUEL, Alfred A, FISCHER, Øystein, MING LI
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
Vortex lattices ,flux pinning, flux creep
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Summary:We present a detailed study of vortex-core spectroscopy in slightly overdoped Bi2Sr2CaCu2O8+delta using a low-temperature scanning tunneling microscope. Inside the vortex core, we observe a fourfold symmetric modulation of the local density of states with an energy-independent period of (4.3 +/- 0.3)a0. Furthermore, we demonstrate that this square modulation is related to the vortex-core states which are located at +/-6 meV. Since the core-state energy is proportional to the superconducting gap magnitude , our results strongly suggest the existence of a direct relation between the superconducting state and the local electronic modulations in the vortex core.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.95.257005