There have been a number of recent works on calculation of the electronic structure of high-temperature superconductors. The crystal structure of YBa2Cu3O7 with unit cell consisting of 13 atoms (eight of which are non-equivalent) has been determined. Atoms Oxy(1) and Oxy(2), together with Cu2, form a copper-oxygen layer. The oxygen atoms Oy and Oz surround Cu1, forming a copper-oxygen chain Oy-Cu1Oy. Neutron diffraction investigations have shown that the oxygen atoms in the chains have vibration amplitude several times larger than any others. Furthermore, these vibrations are highly anisotropic, with greatest amplitude along the z axis. It is interesting, therefore, to examine the influence that these vibrations have on the electronic structure.
|Number of pages||3|
|Journal||Physics of Metals and Metallography|
|Publication status||Published - 1988|