Theory of confined high Tc superconductivity in monovalent metals

Baskaran, G. (2022) Theory of confined high Tc superconductivity in monovalent metals International Journal of Modern Physics B, 36 (27). ISSN 0217-9792

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Official URL: http://doi.org/10.1142/S0217979222501843

Related URL: http://dx.doi.org/10.1142/S0217979222501843

Abstract

Monovalent nontransition metals are robust Fermi liquids. They defy superconductivity even at lowest temperatures (Li is a minor exception: Tc≈0.4 mK). However, Thapa, Pandey, Ghosh and collaborators 8 have reported, from 2018, signals for transient and unstable granular superconductivity at ambient temperatures in Ag nanoparticles embedded in Au matrix. We develop a theory, where competing superconducing, CDW and SDW orders lose and get confined (go off-shell). They leave behind a robust Fermi liquid on-shell. A single half filled band crossing the Fermi level provides a number of special k-space regions for singlet stabilizing umklapp pair scattering and superconductivity stabilizing repulsive pair scattering. Carefully designed perturbations could deconfine a confined superconductivity. We suggest that electron transfer (doping) from Ag nanoparticles to Au matrix (with a higher electronegativity), quasi 2D structural reconstructions (e.g., 9R structure), electronically decoupled 2D patches and 1D segments expose confined superconductivity. Beneath a calm Fermi sea, strong supercurrents may exist in several metals.

Item Type:Article
Source:Copyright of this article belongs to World Scientific Publishing Co Pte Ltd.
ID Code:130176
Deposited On:02 Dec 2022 05:55
Last Modified:05 Dec 2022 05:59

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