Magnetic critical scattering of the pseudogap order parameter in the high-Tc superconductor HgBa2CuO4+d
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 YBa2CuO6.85 with the polarized diffractometer D7 has indeed detected indications of this scattering at the pseudogap temperature. Our preliminary measurement in single layer HgBa2CuO4+d (Hg1201) last November with D7 gives unclear result because of signal-to-noise problems. With improvement of sample quality and mass, and better understanding of using the instrument, we propose to measure this new observation again in Hg1201 to test its universality.
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TANG Yang; Bourges; JEONG Jaehong; MANGIN-THRO Lucile; SIDIS Yvan and WILDES Andrew. (2016). Magnetic critical scattering of the pseudogap order parameter in the high-Tc superconductor HgBa2CuO4+d. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-256
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