Abstract
We synthesized and characterized a new (6 × 6)-periodical 2D compound layer consisting of a Mg network sandwiched between a Pb atomic layer and Si(111) substrate. Angle-resolved photoelectron spectroscopy revealed the close similarity of its electronic structure with that typical for the Pb/Si(111) system. As a result of Mg intercalation, 0.45 eV band bending takes place due to electron doping from Mg (1.27 electron per atom). The electron–phonon coupling constant λ is enhanced (2.54 ± 0.1) compared to the pristine Pb/Si(111) monolayer (0.58 ± 0.1) as derived from temperature-dependent ARPES measurements of the lifetime broadening. Four-point probe transport measurements revealed the abrupt decrease of surface resistance that disappeared in the presence of a magnetic field. It might be an indication of superconducting phase transition. Although we were unable to observe a zero-resistance state and hence to measure Tc directly, we estimated the possible superconducting critical temperature Tc = 1.15 K using the Aslamazov–Larkin correction. This value is close to 1.1 K for the case of pristine Pb/Si(111) system.
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