Anisotropy in the electronic screening of oxygen lattice modes in YBa(2)Cu(3)O(6.95)

Details Anisotropy in the electronic screening of oxygen lattice modes in YBa(2)Cu(3)O(6.95) Anisotropy in the electronic screening of oxygen lattice modes in YBa(2)Cu(3)O(6.95)

2001-05-30

arxiv.org/abs/cond-mat/0105593v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

Inelastic neutron scattering data from a twinned single-crystal of YBa2Cu3O6.95 are presented that show a distinct a-b plane anisotropy in the oxygen vibrations. The Cu-O bond-stretching type phonons are simultaneously observed along the a and b directions due to a 4 meV splitting arising from the orthorhombicity. The present results show the bond-stretching branch along b (parallel to the chain) has a continuous dispersion, while the branch along a is discontinuous, suggesting a possibility of short-range cell-doubling along a. Furthermore, the LO mode along a is split in en-ergy from its TO partner at non-zero q-vectors, while the b mode is not. These results imply strong anisotropy in the electronic screening and a one-dimensional character in underlying charge fluctuations.

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