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Interface superconductivity in LaAlO3-SrTiO3 heterostructures

Klimin, S. N.
Tempere, J.
Devreese, J. T.
Published in Physical Review. B, Condensed Matter. 2014, vol. 89, no. 18, p. 184514
Abstract The interface superconductivity in LaAlO3-SrTiO3 heterostructures reveals a nonmonotonic behavior of the critical temperature as a function of the two-dimensional density of charge carriers. We develop a theoretical description of interface superconductivity in strongly polar heterostructures, based on the dielectric function formalism. The density dependence of the critical temperature is calculated, accounting for all phonon branches including different types of optical (interface and half-space) and acoustic phonons. The longitudinal-optic- and acoustic-phonon mediated electron-electron interaction is shown to be the dominating mechanism governing the superconducting phase transition in the heterostructure.
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KLIMIN, S. N. et al. Interface superconductivity in LaAlO3-SrTiO3 heterostructures. In: Physical Review. B, Condensed Matter, 2014, vol. 89, n° 18, p. 184514. https://archive-ouverte.unige.ch/unige:39170

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Deposited on : 2014-08-05

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