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We present high-resolution triple-axis neutron scattering studies of thehigh-temperature superconductor La1.88Sr0.12CuO4 (Tc=27 K). The temperaturedependence of the low-energy incommensurate magnetic fluctuations revealsdistinctly glassy features. The glassiness is confirmed by the differencebetween the ordering temperature TN ~ Tc inferred from elastic neutronscattering and the freezing temperature Tf ~ 11 K obtained from muon spinrotation studies. The magnetic field independence of the observed excitationspectrum as well as the observation of a partial suppression of magneticspectral weight below 0.75 meV for temperatures smaller than Tf, indicate thatthe stripe frozen state is capable of supporting a spin anisotropy gap, of amagnitude similar to that observed in the spin and charge stripe ordered groundstate of La1.875Ba0.125CuO4. The difference between TN and Tf implies that thesignificant enhancement in a magnetic field of nominally elastic incommensuratescattering is caused by strictly in-elastic scattering -- at least in thetemperature range between Tf and Tc -- which is not resolved in the presentexperiment. Combining the results obtained from our study of La1.88Sr0.12CuO4with a critical reappraisal of published neutron scattering work on sampleswith chemical composition close to p=0.12, where local probes indicate a sharpmaximum in Tf(p), we arrive at the view that the low-energy fluctuations arestrongly dependent on composition in this regime, with anisotropy gapsdominating only sufficiently close to p=0.12 and superconducting spin gapsdominating elsewhere.

Glassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4