What limits the critical temperature for superconductivity in high-temperature superconductors?

05.05.2026 13:00 – 14:00

What causes superconductivity to disappear at the critical temperature Tc in high-temperature superconductors? In my talk, I will discuss two examples. First, I will present the case of underdoped cuprate superconductors, where a pseudogap exists far above Tc. Whether the pseudogap energy is associated with pairing has been a key question debated for decades. Using novel shot-noise experiments, we found that the pseudogap energy is equal to the pairing energy, meaning that pairing persists to very high energies – therefore, superconductivity is limited by coherence [1]. I will also briefly discuss overdoped high-temperature superconductors, where we found that superconductivity breaks down because of the formation of nanometer-sized puddles in a metallic matrix. Again, superconductivity is not limited by the pairing interaction [2].

References
[1] Niu & Ortego, et al. arXiv:2409.15928
[2] Tromp & Benschop, et al. Nature Materials (2023)

Lieu

Bâtiment: Ecole de Physique

Auditoire Stückelberg

entrée libre