Dr. Tonica Valla Profile

Dr. Tonica Valla

at Brookhaven National Lab

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Proceedings Article | 30 August 2005 Paper

Electronic interactions in strongly correlated systems: what is the glue for high temperature superconductivity?

Tonica Valla

Proceedings Volume 5932, 593203 (2005) https://doi.org/10.1117/12.621626

KEYWORDS: Superconductivity, Doping, Superconductors, Scattering, Phonons, Lanthanum, Strontium, Bosons, Particles, Magnetism

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Recent observation of a "kink" in single-particle dispersion in photoemission experiments on cuprate superconductors has re-initiated a heated debate over the issue of a boson that "mediates" the pairing in cuprates. If the "kink" is indeed caused by interaction with a bosonic excitation, then there are two possible candidates: phonons and spin fluctuations. Here, the role of anti-ferromagnetic spin fluctuations in shaping the phase diagram of cuprate superconductors will be discussed. By using the local (momentum-integrated) dynamic spin susceptibility, recently measured in neutron scattering experiments to high energies, the electronic self-energies are calculated that agree in many aspects with those measured directly in angular resolved photoemission and optical spectroscopies. The spin fluctuations therefore seem to play a role typically played by phonons in renormalizing single particles. The key question emerging from this picture is whether the coupling detected in angle-resolved photoemission spectroscopy (ARPES) reflects the mediating boson, i.e. whether the spin fluctuations may be responsible for superconducting pairing.

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