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We report the direct observation of multiple `spin zeroes' in angle-dependentmagnetic quantum oscillations measured up to 85T in YBa2Cu3O6+x, at which theamplitude falls to a deep minimum accompanied by a phase inversion of themeasured quantum oscillations, enabling the product of the effective mass andeffective g-factor m*g* to be tightly constrained. We find an evolution of thelocation of the spin zeros with applied magnetic field, and suggest that thiseffect and the absence of a spin zero at low angles can be produced by morethan one Fermi surface component, and an effective g-factor with a subtleanisotropy between in-plane and out-of-plane crystalline directions.

Direct observation of multiple spin zeroes in the underdoped high temperature superconductor YBa2Cu3O6+x