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Abstract:
Vacuum-tunnelling spectroscopy on superconducting heavy-fermion
compounds should be a suitable method to gain information on the
superconducting order parameter. We constructed a scanning-tunnelling
microscope for the use in a dilution refrigerator. Its miniaturised
design provides good thermal coupling of the sample and excellent
mechanical stability, yielding atomic resolution. We present topographic
and spectroscopic results on graphite (HOPG), as well as on classical
and heavy-fermion superconductors.
