Doping dependence of the q=0 magnetic order in the high-Tc superconductor HgBa2CuO4+d
One of the most interesting feature in high-temperature cuprates is the pseudogap phenomenon: in the normal state, a partial gap opens on the Fermi surface below a temperature T*, leading to peculiar changes in the electronic and magnetic degrees of freedom. Polarized neutron diffraction has revealed universal q = 0 magnetic order (which preserves the lattice translational symmetry) below T*, yet there remain important open questions concerning the nature of this magnetism. For example, the spatial geometry of the magnetically-ordered state has not been fully determined, i.e., whether the magnetic moment lies in the copper-oxygen plane or has a c-axis component as well. Due to its structural simplicity and high transition temperature, HgBa2CuO4+d (Hg1201) is a model system. We have successfully demonstrated the feasibility of measuring the q = 0 order in Hg1201 on D7 (Exp. No. 5-53-256, see ILL report) and observed evidence of c-axis component of the q = 0 order at one doping level. Here we propose to extend this work as a function of hole doping. Due to the simple structure of Hg1201, this will allow us to put constraints on theoretical models for the pseudogap phenomenon.
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GREVEN Martin; ANDERSON Zachary; BOUNOUA Dalila; Bourges; JEONG Jaehong; MANGIN-THRO Lucile; SIDIS Yvan and TANG Yang. (2018). Doping dependence of the q=0 magnetic order in the high-Tc superconductor HgBa2CuO4+d. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-943
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