Search for new low energy magnetic excitations in superconducting cuprates
The phase diagram of high-Tc superconductors is dominated by the mysterious pseudo-gap (PG) phase. Polarized neutron scattering studies in 3 different cuprate families, including YBa2Cu3O6+d, highlighted the existence of an intra-unit-cell (IUC) order that develops when entering the PG state below T*. The observed magnetic signal displays similarities with orbital magnetic order predicted by the loop current theory. We have been recently able to prove the persistence of the magnetic IUC order in a nearly optimally doped YBa2Cu3O6+d sample. Furthermore, moving away from magnetic Bragg reflections, we could observe for the first time low energy magnetic excitations. These fluctuations are likely to be T-independent in the paramagnetic state as expected in Marginal Fermi Liquid Theory and then suddenly change below T* and Tc upon cooling down. Our discovery of new magnetic excitations in superconducting cuprates can open new routes for the understanding of the complex electronic properties of these materials. On the basis of such promising results, we would like to carry out a systematic study of their energy and moment dependencies as a function of temperature on IN20 with CRYPOAD.
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MANGIN-THRO Lucile; Bourges; SIDIS Yvan and STEFFENS Paul. (2014). Search for new low energy magnetic excitations in superconducting cuprates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1352
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