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A new structural phase transition has been observed at low temperatures forthe one third of a monolayer (alpha phase) of Pb on Ge(111) using avariable-temperature scanning tunneling microscope. The well-known (r3xr3)R30to (3x3) transition is accompanied by a new structural phase transition from(3x3) to a disordered phase at ~76 K. The formation of the new disordered phaseis incompatible with the belief that the (3x3) phase is the ground state. Themechanism of the phase transition in this triangular lattice can be mapped ontoantiferromagnetic spin Ising model, with the geometric frustration.Comment: 4 pages, 3 figure

physical review letters

Low Temperature Disordered Phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi mathvariant="normal">P</mml:mi><mml:mi mathvariant="normal">b</mml:mi><mml:mo>/</mml:mo><mml:mi mathvariant="normal">G</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>111</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>

Low Temperature Disordered Phase ofα−Pb/Ge(111)