Volume 119, Number 1, July 2017
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||08 September 2017|
Cooper pairs without “glue” in high-Tc superconductors: A universal phase diagram
1 Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), UMR 7590, Sorbonne Universités, UPMC Paris 6 - 4 place Jussieu, 75252 Paris Cedex 05, France
2 Institut des Nanosciences de Paris (INSP), UMR 7588, Sorbonne Universités, UPMC Paris 6 4 place Jussieu, 75252 Paris Cedex 05, France
Received: 19 July 2017
Accepted: 14 August 2017
The phase diagram of high-Tc cuprates can be understood, without resorting to a boson mode, in terms of a single energy scale , the antiferromagnetic (AF) exchange energy at the metal-insulator transition. As a result, holes form a new quantum object, the “pairon”, i.e., a pair of holes localized within their local antiferromagnetic environment on the scale of the finite AF correlation length, . In the incoherent pseudogap phase, above Tc or within the vortex core, the pairon binding energies are distributed statistically, forming a “Cooper-pair glass”. Contrary to conventional superconductors it is the mutual pair-pair interaction that is responsable for their condensation. We give a natural explanation for the ergodic rigidity of the excitation gap, the latter being constant with respect to a perturbation such as temperature or magnetic field, and determined only by the carrier concentration p and J.
PACS: 74.20.Mn – Nonconventional mechanisms / 74.20.Fg – BCS theory and its development
© EPLA, 2017
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