Momentum dependence of the lower energy novel pseudogap excitation in HgBa2CuO4+d
Our inelastic neutron scattering studies of the high-Tc superconductor Hg1201 led to the observation of two novel magnetic excitation branches associated with previously observed q=0 pseudogap magnetic order. The momentum dependence of the higher-energy mode is inconsistent with traditional magnetic form factors. This, in combination with preliminary polarized inelastic neutron scattering results, indicates possible dual magnetic and structural characteristics of the novel excitations. In an upcoming experiment on IN20, we will utilize polarized neutrons to disentangle magnetic and non-magnetic contributions to the high-energy mode. The low-energy mode does not obey traditional form factors either. Additionally, we observe an almost opposite momentum transfer dependence of the two modes: whereas the high-energy mode is weakest for momentum transfer in the ab plane, the opposite is true for the low-energy mode. This points toward a deep relationship between the two modes. In order to obtain a complete picture of the novel pseudogap excitations, we propose to extend our study of the form factor of the low-energy mode in Hg1201 with polarized neutrons on IN20.
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GREVEN Martin; Bourges; CHAN Mun; MANGIN-THRO Lucile; SIDIS Yvan; STEFFENS Paul; TANG Yang and YU Guichuan. (2013). Momentum dependence of the lower energy novel pseudogap excitation in HgBa2CuO4+d. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1269
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