Hamburg 2001 – scientific programme

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DY: Dynamik und Statistische Physik

DY 43: Kritische Ph
änomene und Phasenumwandlungen

DY 43.8: Talk

Thursday, March 29, 2001, 12:15–12:30, S 7

Direct Observation of a Coupling Between Configurational Fluctuations in a Cu₃Au Nano-Particle — •M. Linde¹, J. Trenkler¹, V. Bugaev², Y. Sikula², K. Du¹, F. Phillipp¹, and H. Dosch¹ — ¹Max-Planck-Institut für Metallforschung, Heisenbergstr. 1, 70569 Stuttgart — ²Institute for Metal Physics, National Academy of Sciences of Ukraine, 252680, Kiev, Ukraine

We established an experimental technique to study space- and time-resolved configurational fluctuations of a 15 nm large Cu₃Au nano-particle at the order-disorder phase transformation by a modified high-resolution TEM technique. Our HRTEM observations and complementary Monte Carlo simulations show evidence for a strong coupling between concentration and order fluctuations, affirming our conjecture that the coupling is mediated by thermodynamic driving forces occurring just below the order-disorder phase transformation temperature.