Orbital moments in high-Tc cuprates
The phase diagram of high temperature copper oxides superconductors is dominated by a pseudo-gap phase with highly unusual physical properties. In a serie of recent polarized neutron experiments at LLB-Saclay, we discovered a novel magnetic order specific to that pseudogap state in various cuprate systems. The observations are consistent with the symmetry of microscopic circulating currents creating orbitals moments as it has been theoritically proposed by C.M. Varma. In a previous expriment, we proved that this experiment is also feasible on D7. We wish to take advantage of the higher flux of polarized neutrons of D7 to adress a few issues discussed in the litterature. In particular, we have recently observed a magnetic diffuse scattering near the magnetic ordering temperature in the doping regime where the superconductivity is maximal (optimal doping). We ask for 10 days of beam time using the XYZ mode on a single crystal of YBa2Cu3O6.85 near optimal doping to map this magnetic diffuse scattering.
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MANGIN-THRO Lucile; Bourges; SIDIS Yvan and WILDES Andrew. (2013). Orbital moments in high-Tc cuprates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-234
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