We use inelastic neutron scattering to demonstrate that the low-frequency magnetic fluctuations in YBa2Cu3O6.6 (Tc = 62.7 K) change from commensurate to incommensurate on cooling with the incommensurability first appearing at temperatures above Tc. For the energies studied, the susceptibility at incommensurate positions increases on cooling below Tc, accompanied by a suppression of the spin fluctuations at the commensurate points. These results suggest that incommensurate spin fluctuations may be a common feature for all cuprate superconductors.
P. Dai et al., "Incommensurate Magnetic Fluctuations in YBa2Cu3O6.6," Physical Review Letters, vol. 80, no. 8, pp. 1738-1741, American Physical Society (APS), Feb 1998.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.80.1738
Materials Science and Engineering
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