STM studies of the electronic structure of vortex cores in Bi(2)Sr(2)CaCu(2)O(8+delta)
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.
Pan
SH
Department of Physics, University of California, Berkeley, California 94720-7300, USA.
Hudson
EW
Gupta
AK
Ng
K
Eisaki
H
Uchida
S
Davis
JC