High-resolution angle-integrated photoemission of one monolayer of C-60 chemisorbed on Ag(100) shows the reversible opening of a gap at the Fermi level at temperatures 25 less than or equal to T less than or equal to 300 K. The gap reaches a maximum value of approximate to 10 meV at T less than or equal to 70 K. This finding is the first evidence of an electronic phase transition in C-60 monolayers and has implications on the ongoing debate about surface superconductivity in C-60-based bulk materials.
Temperature-dependent Fermi gap opening in the c(6 x 4)-C-60/Ag(100) two-dimensional superstructure / C. Cepek, I. Vobornik, A. Goldoni, E. Magnano, G. Selvaggi, J. Kröger, G. Panaccione, G. Rossi, M. Sancrotti. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 86:14(2001), pp. 3100-3103. [10.1103/PhysRevLett.86.3100]
Temperature-dependent Fermi gap opening in the c(6 x 4)-C-60/Ag(100) two-dimensional superstructure
G. Rossi;
2001
Abstract
High-resolution angle-integrated photoemission of one monolayer of C-60 chemisorbed on Ag(100) shows the reversible opening of a gap at the Fermi level at temperatures 25 less than or equal to T less than or equal to 300 K. The gap reaches a maximum value of approximate to 10 meV at T less than or equal to 70 K. This finding is the first evidence of an electronic phase transition in C-60 monolayers and has implications on the ongoing debate about surface superconductivity in C-60-based bulk materials.
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