Confinement-driven metal-insulator transition and polarity-controlled conductivity of epitaxial LaNiO3/LaAlO3 (111) superlattices | Zendy

Haoming Wei | Zendy; Marius Grundmann | Zendy; Michael Lorenz | Zendy

Open Access

Confinement-driven metal-insulator transition and polarity-controlled conductivity of epitaxial LaNiO3/LaAlO3 (111) superlattices

Author(s) -

Haoming Wei,

Marius Grundmann,

Michael Lorenz

Publication year - 2016

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4961693

Subject(s) - superlattice , condensed matter physics , materials science , epitaxy , conductivity , insulator (electricity) , polar , metal–insulator transition , variable range hopping , electrical resistivity and conductivity , band gap , monolayer , metal , optoelectronics , layer (electronics) , nanotechnology , chemistry , physics , metallurgy , composite material , astronomy , quantum mechanics , thermal conduction

Recently, topological conductivity has been predicted theoretically in LaNiO3(111)-based superlattices. Here we report high-quality epitaxial LaNiO3/LaAlO3 superlattices on (111)-oriented SrTiO3 and LaAlO3 single crystals. For both substrates a metal-insulator transition with decreasing number of LaNiO3 monolayers is found. While the electrical transport is dominated by two-dimensional variable range hopping for superlattices grown on polar mismatched SrTiO3(111), it switches to a thermally activated single gap behavior on polar matched LaAlO3(111). The gap energy of the polar double-layer LaNiO3 superlattices can be tuned via the thickness of the insulating LaAlO3 layers.

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