Progress and prospects of high-temperature superconductivity

Orateur : Wojciech TABIS (LNCMI, Toulouse, France)

A longstanding conundrum regarding the high-Tc superconductivity in copper oxides concerns the nature of the normal state from which the superconductivity develops. For a wide range of charge carrier concentration, the suppression of the superconductivity upon increasing temperature or a pplying magnetic field leads to the ’pseudogap’ regime, a state with an ambiguous name that reflects an empirically well-defined set of electronic changes in the electronic structure whose underlying order parameter has not yet been established1. There exists evidence for various fluctuating or static order parameters within the pseudogap regime, such as charge-density-wave2,3, spin-density-wave4 or electronic-nematic order5. Characterizing and understanding these orders is generally considered an essential step toward unraveling the actual mechanism of high-Tc superconductivity. The combination of high magnetic fields with state-of-the-art X-ray and neutron scattering techniques is a novel experimental approach which can significantly improve our understanding of these ordered states. I will review the most recent experimental achievements in the field of the cuprates and propose a series of X-ray, neutron scattering and complementary electronic transport measurements to be perform ed in very high magnetic fields with the aim to discern the order parameter associated with the enigmatic pseudogap phase and to understand the hierarchy of, and interplay among coexisting electronic orders.

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