Ion-induced phase transition in the Au-In system

The Au-In equilibrium phase diagram exhibits a large number of intermetalli c phases which have recently been explored via perturbed angular correlatio n spectroscopy, using alloyed and/or diffused In-111 probes. In the present work we report on the phase transition from Au7In3 (hexagonal, gamma'-phas e) to Au9In4 (gamma-brass phase) induced via Xe- or Ar-ion implantations at 80 K. We compare the hyperfine parameters with those obtained in thermal e quilibrium and after quenching, and argue that ion beam mixing and fast coo ling in the condensation phase of thermal (local) spikes are the predominan t mechanisms to interpret our findings.