Pseudogap and incommensurate magnetic fluctuations in YBa_2Cu_3O_{6. 6}

Details Pseudogap and incommensurate magnetic fluctuations in YBa_2Cu_3O_{6. 6} Pseudogap and incommensurate magnetic fluctuations in YBa_2Cu_3O_{6. 6}

1997-12-29

arxiv.org/abs/cond-mat/9712311v1

Physics

Condensed Matter

Superconductivity

6 pages, 3 ps figs, Proceedings of ICNS, Physica B, to be published

Scientific paper

Unpolarized inelastic neutron scattering is used to study the temperature and wave vector dependence of the dynamical magnetic susceptibility, $\chi''(q,\omega)$, of a well characterized single crystal $YBa_2Cu_3O_{6.6}$ ($T_c=62.7$ K). We find that a pseudogap opens in the spin fluctuation spectrum at temperatures well above $T_c$. We speculate that the appearance of the low frequency incommensurate fluctuations is associated with the opening of the pseudogap. To within the error of the measurements, a gap in the spin fluctuation spectrum is found in the superconducting state.

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