Quantitative Determination of the Pairing Interactions for High Temperature Superconductivity in Cuprates

Chandra Varma (UCR)
Event Date and Time: 
Mon, 2015-11-09 12:00 - 13:00
Hennings 318
Local Contact: 
andrea Damascelli
I will report report on the laser based angle-resolved photoemission data taken at IOP Beijing and its analysis. This has led to the first quantitative determination of the attractive effective interactions in the cuprates in the (d)- wave pairing symmetry, as well as their repulsive counterpart in the full symmetry of the lattice. Near Tc, the repulsive and the attractive interactions are independent of frequency, with nearly the same value, over most of the energy range up to about 0.4 eV except for a low energy 50 meV feature present only in the repulsive part which has less than 10% of the total spectral weight. Well below Tc, they both change similarly by superconductivity induced features at low energies. This exposes the central paradox of the high Tc problem as to how frequency independent fluctuations can dominantly scatter at angles ±π/2 in the attractive channel as well as angle-independent repulsive scattering in the full symmetry. The results are compared with ideas and calculations on this long standing problem.
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