Magnetic and non-magnetic contributions to the novel pseudogap excitations in the high-Tc superconductor HgBa2CuO4+d
Our recent inelastic neutron scattering (INS) studies of the model high-Tc superconductor HgBa2CuO4+d (Hg1201) led to the observation of two novel magnetic excitation branches that are different from the universal hourglass-like dispersion in other hole-doped cuprates (ILL news 17.12.2010: High-Temperature Superconductors reveal part of their mystery!). These excitations appear below the pseudogap temperature T* and likely originate from the novel magnetic order that has recently been established to be universally present in the cuprates. Recently we have observed momentum transfer dependence of the high energy mode to be inconsistent with traditional magnetic or structural form factors. This, in combination with preliminary polarized inelastic neutron scattering results, indicate possible magnetic and structural characteristics of the novel excitations at intermediate and large momentum transfers. We propose to study the novel excitation with polarized neutrons in both the spin-flip and non-spin-flip channels in order to determine its true magnetic and structural momentum transfer dependence.
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Bourges; CHAN Mun; DOROW Chelsey; GREVEN Martin; LI Yuan; LI Yangmu; MANGIN-THRO Lucile; SIDIS Yvan; STEFFENS Paul; WHEELER Elisa and YU Guichuan. (2012). Magnetic and non-magnetic contributions to the novel pseudogap excitations in the high-Tc superconductor HgBa2CuO4+d. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1142
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