[1Ca02-12] SS1

[1Ca04Y] Observation of structure and electronic states of a single-layer Kondo lattice CePt₆/Pt(111)

*koichiro ienaga^1,2, Sunghun Kim^1,3, Toshio Miyamachi^1,4, Fumio Komori^1,5 (1. ISSP, the Univ. of Tokyo, 2. Dept. of Phys., Tokyo Tech., 3. KAIST, 4. ImaSS, Nagoya Univ., 5. IIS, the Univ. of Tokyo)

We grew 1 unit layer (u.l.) of a Ce-Pt intermetallic compound on Pt(111) and observed the structure and the electronic states using scanning tunneling microscopy/spectroscopy. Atomically resolved observation revealed the formation of an ordered (2×2)-CePt₆/Pt(111) with a pure Pt atomic layer at the surface. By measuring quasiparticle interference at 5 K, we found that the surface state on Pt(111) above Fermi energy shifts downward on the topmost Pt layer of the 1 u.l. CePt₆, indicating charge transfer from the underneath CePt₂ layer. The observed zero-bias anomaly in the tunneling spectra suggests a coherent Kondo state.