STM Studies of the Electronic Structure of Vortex Cores in Bi2Sr2CaCu2O81d
نویسندگان
چکیده
We report on low temperature scanning tunneling microscopy (STM) studies of the electronic structure of vortex cores in Bi2Sr2CaCu2O81d. At the vortex core center, an enhanced density of states is observed at energies near V 67 meV. Spectroscopic imaging at these energies reveals an exponential decay of these “core states” with a decay length of 22 6 3 Å. The fourfold 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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