• Lehrbücher
• Publikationen
•   - 1990-2000
•     - 1990
•     - 1991
•     - 1992
•     - 1993
•     - 1994
•     - 1995
•     - 1996
•     - 1997
•     - 1998
•     - 1999
•     - 2000
•   - 2001-2010
• Vorträge

Abstract

Energy gap distribution on polycristalline HgBa₂CuO_4+d observed by scanning tunneling spectroscopy

Polycristalline HgBa₂CuO_4+d (T_c = 96 K) is studied in the superconducting state using a low temperature scanning tunneling microscope (STM). The superconducting energy gap D is determined by electron tunneling spectroscopy at different locations on the sample surface. Histograms of the extracted gaps reveal 2 values (8.5 ± 1.6 meV and 15.1 ± 1.4 meV). We attribute this result to the presence of different crystallographic faces with different gap values, indicating gap anisotropy.