Abstract
Low-temperature scanning tunneling microscopy studies have been performed on YBa 2Cu 3O 7− δ single crystals. We present two types of atomic images corresponding to BaO- and CuO-chain layers, which vary with applied bias voltage and temperature. At low bias voltage, the electronic modulation images of the CuO-chain layer tend to be emphasized. Warming the sample up to about 45 K alters the atomic images of the BaO layers but does not alter those of the CuO-chain layers. These results suggest that the electronic modulation images are closely related to the electronic states near the Fermi level and are attributed to the charge density wave.
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