Incommensurate Magnetic Fluctuations in YBa2Cu3O6.6

Details Incommensurate Magnetic Fluctuations in YBa2Cu3O6.6 Incommensurate Magnetic Fluctuations in YBa2Cu3O6.6

1997-07-10

arxiv.org/abs/cond-mat/9707112v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, Latex, 4 figures

Scientific paper

10.1103/PhysRevLett.80.1738

We use inelastic neutron scattering to demonstrate that at low temperatures, the low frequency magnetic fluctuations in YBa_2Cu_3O_{6.6} ($T_c=62.7$ K) are incommensurate, being found at positions displaced by $\pm\delta$ ($0.057\pm 0.006$ r.l.u.) along the $[\pi,\pi]$ direction from the wave vector $(\pi,\pi)$ associated with the antiferromagnetic order of the parent insulator, YBa_2Cu_3O_{6}. The dynamical susceptibility $\chi''(q,\omega)$ at the incommensurate positions increases on cooling below $T_c$, accompanied by a suppression of magnetic fluctuations at the commensurate points.

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