Author/Authors :
A Shukla، نويسنده , , B Barbiellini، نويسنده , , A Erb، نويسنده , , A Manuel، نويسنده , , B Revaz، نويسنده , , T Buslaps، نويسنده , , V Honkimaki، نويسنده , , P Suortti، نويسنده ,
Abstract :
We have measured the electron momentum density in both insulating PrBa2Cu3O7−δ and superconducting YBa2Cu3O7−δ. We find a remarkable difference in the anisotropy of the momentum density, even though LDA based calculations predict similar behaviour for both. Our results can be explained assuming Pr on Ba-site substitution disorder and we propose that this phenomenon is responsible for the observed effects.
