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We present a comprehensive inelastic neutron scattering study of the magneticexcitations in twin-free YBa(2)Cu(3)O(6.6) (Tc=61 K) for 5 K < T < 290 K.Taking full account of the instrumental resolution, we derive analytical modelfunctions for the magnetic susceptibility chi''(Q,omega) at T = 5 K and 70 K inabsolute units. Our models are supported by previous results on similar samplesand are valid at least up to excitation energies of omega = 100 meV. Thedetailed knowledge of chi''(Q,omega) permits quantitative comparison to theresults of complementary techniques including angle-resolved photoemissionspectroscopy (ARPES), as demonstrated in Dahm et al., Nature Phys. 5, 217,(2009). Based on accurate modeling of the effect of the resolution function onthe detected intensity, we determine important intrinsic features of the spinexcitation spectrum, with a focus on the differences above and below Tc. Inparticular, at T = 70 K the spectrum exhibits a pronounced twofold in-planeanisotropy at low energies, which evolves towards fourfold rotational symmetryat high energies, and the relation dispersion is "Y"-shaped. At T = 5 K, on theother hand, the spectrum develops a continuous, downward-dispersing "resonant"mode with weaker in-plane anisotropy. We understand this topology change asarising from the competition between superconductivity and the same electronicliquid-crystal state as observed in YBa(2)Cu(3)O(6.45). We discuss our data inthe context of different theoretical scenarios suggested to explain this state.

Neutron scattering study and analytical description of the spin excitation spectrum of twin-free YBa(2)Cu(3)O(6.6)