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Published on: February 1, 2017
STM studies of the electronic structure of vortex cores in Bi(2)Sr(2)CaCu(2)O(8+delta)
1Department of Physics, University of California, Berkeley, California 94720-7300, USA.
Abstract:
We report on low temperature scanning tunneling microscopy (STM) studies of the electronic structure of vortex cores in Bi 2Sr 2CaCu 2O (8+delta). At the vortex core center, an enhanced density of states is observed at energies near Omega = +/-7 meV. Spectroscopic imaging at these energies reveals an exponential decay of these "core states" with a decay length of 22+/-3 A. 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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