Influence of oxygen isotope exchange on the novel magnetic excitations in HgBa2CuO4+d
The pivotal issue in the study of the cuprates is to determine the bosonic glue that leads to superconductivity. In general, a mixing of the phononic and magnetic degrees of freedom is possible. Isotope shifts suggestive of phonon involvement have been observed in photoemission and tunneling measurements of the Bismuth-based compounds. Our recent inelastic neutron scattering work revealed well-defined (in energy) novel magnetic excitations in the pseudogap state in HgBa2CuO4+d (Hg1201) at similar energies. Although the magnetic nature of these modes at relatively low momentum transfers has been established from polarized neutron scattering, our latest results point toward a possible mixing of magnetic and lattice degrees of freedom at large momentum transfers. We propose to perform measurements on 18O isotope-exchanged Hg1201 samples to determine if there is an isotope shift of the mode energies.
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CHAN Mun; Bourges; GREVEN Martin; MANGIN-THRO Lucile; SIDIS Yvan; STEFFENS Paul and TANG Yang. (2013). Influence of oxygen isotope exchange on the novel magnetic excitations in HgBa2CuO4+d. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1289
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