Abstract
Experimental techniques for tunneling into bulk superconductors have been tested for the investigation of crystal field effects in LaAl2, LaSn3 and LaPb3 doped with Tb, Nd, or Pr. The evaporation of counterelectrodes onto cleaved and oxidized crystals failed in most cases, but Schottky contacts with GaAs electrodes could be prepared reproducibly by mechanical adjustment of the junction resistance at mK temperature. Problems remain resulting from the specific mechanical and structural properties of the metallic compounds under investigation.
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Niksch, M., Hoenig, H.E. Tunneling within the mK range for the investigation of crystal field effects in superconductors. Z Physik B 37, 281–287 (1980). https://doi.org/10.1007/BF01352737
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DOI: https://doi.org/10.1007/BF01352737