Orateur
Description
After more than thirty years of research, the microscopic mechanism of high-Tc superconductivity is still unknown. However, the remarkable universality of the cuprate Tc-dome suggests a very fundamental unifying principle.
The superconducting gap is known to persist above Tc in the enigmatic pseudogap phase. So, contrary to BCS, the gap cannot be the order parameter of the transition.
In this work, we focus on the typical T-p phase diagram where p is the hole carrier concentration. We propose that both the Tc -dome and the pseudogap line T(p) arise from a unique and identifiable principle: the interaction of localized hole pairs, or ‘pairons*’, in real space on an antiferromagnetic square lattice [1].
In this view, the pseudogap state is revealed: it consists of incoherent pairons while the superconducting state is the result of a disorder to order transition.
The model matches both the T* and Tc experimental lines, with only one adjustable parameter, which we identify as an effective magnetic exchange energy.
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[1] Yves Noat, Alain Mauger, William Sacks, Superconductivity in cuprates governed by topological constraints. Physics Letters A 444, 128227 (2022).
| Affiliation de l'auteur principal | CNRS - Institut des Nanosciences de Paris |
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