The electric quadrupole hyperfine interaction at indium surfaces has been detected with use of the perturbed angular correlation technique. The electric-field gradient at the surface is found to be |Vzz(surface)|=5.6(6)×1017 V/cm2 with an orientation perpendicular to the surface. This is a drastic enhancement of the field gradient compared with bulk by a factor |Vzz(surface)Vzz (bulk)|~4. The result is discussed in a simple one-Wigner-Seitz-cell model.
Physical Review Letters
- Pub Date:
- December 1982
- Nuclear states and interactions;
- Other topics in electronic structure and electrical properties of surfaces interfaces thin films and low-dimensional structures;
- Mossbauer effect;
- other gamma-ray spectroscopy