STM Studies of the Electronic Structure of Vortex Cores in Bi2Sr2CaCu2O8+d

Details STM Studies of the Electronic Structure of Vortex Cores in Bi2Sr2CaCu2O8+d STM Studies of the Electronic Structure of Vortex Cores in Bi2Sr2CaCu2O8+d

2000-05-27

arxiv.org/abs/cond-mat/0005484v1

Physics

Condensed Matter

Superconductivity

Submitted to Physical Review Letters. Address correspondence to jcdavis@socrates.berkeley.edu

Scientific paper

10.1103/PhysRevLett.85.1536

We report on low temperature scanning tunneling microscopy (STM) studies of the electronic structure of vortex cores in Bi2Sr2CaCu2O8+d (BSCCO). At the vortex core center, an enhanced density-of-states (DOS) is observed at energies near 7 meV. Spectroscopic imaging at these energies reveals an exponential decay of these 'core states' with a decay length of 2.2(3) nm. The four-fold symmetry sometimes predicted for d-wave vortices is not seen in spectroscopic vortex images. A locally nodeless order parameter induced by the magnetic field may be consistent with these measurements.

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