STM Studies of the Electronic Structure of Vortex Cores inBi2Sr2CaCu2O8+δ

2000/05/27 by S. H. Pan, Eric Hudson, E. W. Hudson +8 · 21 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.85.1536

Submitted to Physical Review Letters. Address correspondence to [email protected]

arxiv created 2000/05/27 · openalex publication_date 2000/08/14 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report on low temperature scanning tunneling microscopy (STM) studies of the electronic structure of vortex cores in Bi₂Sr₂CaCu₂O_8+\ensuremathδ. At the vortex core center, an enhanced density of states is observed at energies near \ensuremathΩ\phantom\rule0ex0ex=\phantom\rule0ex0ex\ifmmode±\else\textpm\fi7meV. Spectroscopic imaging at these energies reveals an exponential decay of these ``core states'' with a decay length of 22\ifmmode±\else\textpm\fi3\AA. 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.

Citations

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