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New insight into the phase diagram of the cuprates - Martin Greven

University of Minnesota, Minneapolis,

Bât T-18 – Parc Club Orsay

The discovery of high-temperature superconductivity in the cuprates three decades ago triggered a tremendous amount of scientific activity, yet it has remained a challenge to understand the unusual “normal” state from which the superconductivity evolves upon cooling. I will review our neutron scattering, X-ray scattering and charge transport results for HgBa2CuO4+δ, arguably one of the most ideal cuprate compounds for experimental study due to its high structural symmetry and high superconducting transition temperature of nearly 100 K at optimal hole doping. These experiments reveal an unusual magnetic response, charge-density-wave correlations and Fermi-liquid behavior below optimal hole doping. I will show how the comparison with the properties of other compounds gives new insight into the underlying phase diagram of the cuprates.


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