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O: Fachverband Oberflächenphysik

O 31: Poster Session - Metal substrates: Structure, Epitaxy and Growth

O 31.3: Poster

Montag, 16. März 2020, 18:15–20:00, P1C

Inverse melting of Ni on Re(0001) — Johannes Regel, •Torge Mashoff, and Hans-Joachim Elmers — Institut für Physik, Johannes Gutenberg-Universität, Mainz

Usually, cooling a metal sample down to cryogenic temperatures leads to an immobility of the surface atoms. In rare cases an opposite behavior has been observed under extreme conditions, where cooling leads to an increase in entropy and thus to a higher mobility of the surface atoms. This process is known as inverse melting. In our case a combination of a small force induced by the STM-tip and the weakened bonding between the Ni atoms results in mobile Ni atoms at island edges.
We prepare coverages between 0.1 ML and 10 ML of Ni on a Re(0001)-surface and investigate the mobility of the Ni atoms using scanning tunneling microscopy at temperatures between 4.8 K and room temperature. Sequences of STM-images show an increased mobility of Ni atoms at low temperatures.