Research Meeting: Doping dependence of the antiferromagnetic response of HgBa2CuO4+δ

Antiferromagnetic correlations have been argued to be the cause of the d-wave superconductivity and of the pseudogap phenomena exhibited by the cuprates. Neutron scattering measurements of the antiferromagnetic response have been reported for a number of cuprates, but our study of structurally simple HgBa2CuO4+δ (Hg1201) shows several features distinct from what has been found in other materials. In particular, at most dopings and temperatures we see a gapped Y-shaped magnetic dispersion in contrast to the X-shaped response seen in other cuprates. We will discuss our ongoing efforts to understand the doping dependence of the magnetic spectrum in Hg1201.