Abstract
Angle-resolved photoemission measurements have been performed on (Formula presented) which consists of two-leg (Formula presented) ladders and edge-sharing (Formula presented) chains. The data are consistent with the existence of a dispersive band near the Fermi level which has the periodicity of the ladder sublattice. The band shows a minimum binding energy at (Formula presented) suggesting that a Mott-Hubbard gap opens on the ladder. The experimental result shows a qualitative agreement with the (Formula presented) ladder calculation. It was also found that replacement of Sr with Ca causes a transfer of holes from the chain to the ladder.
Original language | English |
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Pages (from-to) | 7870-7873 |
Number of pages | 4 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 56 |
Issue number | 13 |
DOIs | |
Publication status | Published - 1997 |