Four-fold structure of vortex core states in Bi2Sr2CaCu2O8 (Bi2212)

Details Four-fold structure of vortex core states in Bi2Sr2CaCu2O8 (Bi2212) Four-fold structure of vortex core states in Bi2Sr2CaCu2O8 (Bi2212)

2005-03-09

arxiv.org/abs/cond-mat/0503219v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures. Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.95.257005

We present a detailed study of vortex core spectroscopy in slightly overdoped Bi2Sr2CaCu2O8 using a low temperature scanning tunneling microscope. Inside the vortex core we observe a four-fold symmetric modulation of the local density of states with an energy-independent period of (4.3\pm 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.

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