Abstract
We present Compton profile (CP) anisotropies measured on the high- T c (HTc) superconductor Bi 1.6Pb 0.4Sr 2Ca 2Cu 3O 10+ x . Our results, based on measurements of high statistical accuracy, reveal the existence of an excess charge of about 0.8 electrons in the basal planes, possessing a rather low component of momentum. This can be attributed to the strong metallic behavior of these planes. Furthermore, symmetric features on the directional CP difference indicate that Bi–O bands are not crossing the Fermi level, confirming previous experimental evidence that Bi–O bands are not of metallic character.
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