Abstract
Evidence is presented that the superconductivity of La2 −β Srβ CuO4 and La2CuO4+δ occurs via holes in the LaO planes, rather than in the CuO2 planes.
Acknowledgement
We thank the US Office of Naval Research for their support (contract N00014-98-10137).
Notes
‡ Email: [email protected].
† The charges transferred for the compositions with β≪ 0.2 reported here differ from those reported earlier (Blackstead and Dow Citation1995a, Citationb, Citation1997). We thank Professor B. Batlogg for calling our attention to an error in the computation of the earlier charges.
† J. D. Dow thanks S. Schuppler and Y. Idzerda for discussing these data with him.