Coordination of the energy and temperature scales of pairing across the doping phase diagram of Bi₂Sr₂CaCu₂O_8+δ

2015/09/04 by T. J. Reber, Reber, T. J., Stephen Parham +33
Physics and Astronomy · Materials Science · #Physics of Superconductivity and Magnetism #Magnetic properties of thin films #Chemical and Physical Properties of Materials

paper · pdf · doi:10.48550/arxiv.1509.01556

Abstract

Using a new variant of photoelectron spectroscopy, we measure the homogeneous near-nodal pairing (Δ) and pair-breaking self-energy (Γ_S) processes for a wide range of doping levels of Bi₂Sr₂CaCu₂O_8+δ. For all samples we find that the pairing extends above the superconducting transition T_c to a scale T_Pair that is distinct from the antinodal pseudogap scale T^* and near but slightly above T_c. We find that Δ and T_Pair are related with a strong coupling ratio 2Δ /k_BT_Pair≈6 across the entire doping phase diagram, i.e. independent of the effects of antinodal pseudogaps or charge-density waves.

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