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Recent neutron scattering and transport data obtained on underdoped YBCO,with strong signatures of rotation symmetry breaking at low temperatures, pointtoward electron-nematic order in the charge sector. Such order may originatefrom a uniform distortion with d-wave symmetry or as a precursor of auni-directional stripe phase. Here, we discuss whether the neutron scatteringdata can be linked to incipient charge stripes. We employ and extend aphenomenological model for collective spin and charge fluctuations and analyzethe resulting spin excitation spectrum under the influence of latticeanisotropies. Our results show that the experimentally observedtemperature-dependent magnetic incommensurability is compatible with a scenarioof incipient stripes, the temperature dependence being due to the temperaturevariation of both strength and correlation length of the charge stripes.Finally, we propose further experiments to distinguish the possible theoreticalscenarios.

Tendencies toward nematic order in YBa2Cu3O6+x: Uniform distortion vs. incipient charge stripes