Magnetic critical scattering of the pseudogap order parameter in the high-Tc superconductor HgBa2CuO4+delta
It is often argued that the superconductivity in the cuprates is mediated by fluctuations of a distinct order parameter. One of the most interesting is the circulating current (CC) order proposed to explain the pseudogap state. Elastic polarized neutron experiments have indeed detected signatures of magnetic scattering on top of select nuclear Bragg peaks as expected for a model involving two-cirulating current/CuO2 plaquette. This so called q=0 order was found to appear in the pseudogap state universally in the cuprates. If this detected order is truly due to the novel CC order, critical magnetic scattering is expected to be observed upon approaching the ordering temperature. Recent work on double layer YBa2CuO6+δ with the polarized diffractometer D7 has indeed detected indications of this scattering at the pseudogap temperature. We here propose to test the universality of this new observation on the model single layer cuprate close to optimal doping.
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CHAN Mun; Bourges; MANGIN-THRO Lucile; SIDIS Yvan; TANG Yang and WILDES Andrew. (2014). Magnetic critical scattering of the pseudogap order parameter in the high-Tc superconductor HgBa2CuO4+delta. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-237
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