Theory of superconductivity due to Ngai’s mechanism in lightly doped SrTiO3
Jeudi 9 septembre 2021 14:00
- Duree : 1 heure
Lieu : VISIO-CONFERENCE
Orateur : Mikhail FEIGEL'MAN (L.D.Landau Institute for Theoretical Physics)
Lien pour suivre par visioconférence : https://univ-grenoble-alpes-fr.zoom.us/j/97625027519?pwd=YTNlWDcxajFEcWhndk5QN2dSdGRldz09
Abstract :
We develop a theory of superconducting pairing in low-density Strontium titanate due to quadratic coupling of electron density to soft transverse opt ical phonons. It leads to static attractive potential between electrons which decay length scales inversely with soft optical gap. For low electron densities attraction between electrons is local and transition temperature Tc was found. The Tc(n) dependence in agreement with experimental data for low doping was calculated. Next, we show that suppression of Tc by hydrostatic pressure and strong increase of Tc due to isotopic substitution are explained within our theory.
Contact : florence.levy-bertrand@neel.cnrs.fr
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