Polarons and confinement of electronic motion to two dimensions in a layered manganite

Nature
H M RønnowY Tokura

Abstract

A remarkable feature of layered transition--metal oxides-most famously, the high-temperature superconductors--is that they can display hugely anisotropic electrical and optical properties (for example, seeming to be insulating perpendicular to the layers and metallic within them), even when prepared as bulk three-dimensional single crystals. This is the phenomenon of 'confinement', a concept at odds with the conventional theory of solids, and recognized as due to magnetic and electron-lattice interactions within the layers that must be overcome at a substantial energy cost if electrons are to be transferred between layers. The associated energy gap, or 'pseudogap', is particularly obvious in experiments where charge is moved perpendicular to the planes, most notably scanning tunnelling microscopy and polarized infrared spectroscopy. Here, using the same experimental tools, we show that there is a second family of transition-metal oxides--the layered manganites La(2-2x)Sr(1+2x)Mn2O7--with even more extreme confinement and pseudogap effects. The data demonstrate quantitatively that because the charge carriers are attached to polarons (lattice- and spin-textures within the planes), it is as difficult to remove them from the planes...Continue Reading

References

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Citations

Mar 3, 2011·Nature Communications·B BryantG Aeppli
Aug 4, 2010·Proceedings of the National Academy of Sciences of the United States of America·Vincent MeunierE W Plummer
Mar 12, 2015·ACS Nano·Alexander TselevSergei V Kalinin
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Dec 4, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Gayan Prasad HettiarachchiHalimaton Hamdan
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Jul 22, 2015·Physical Review Letters·Matteo Baggioli, Oriol Pujolàs
Sep 24, 2016·Physical Review Letters·C M YimG Thornton
Jul 7, 2018·Physical Review Letters·Merlin PohlitSteffen Wirth
Jan 26, 2011·Chemistry : a European Journal·Raquel Cortés-GilJosé M González-Calbet
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May 9, 2015·Physical Review Letters·S Karmakar, Pallavi S Malavi
Oct 2, 2009·Physical Review Letters·S BordácsY Tokura
Apr 7, 2010·Physical Review Letters·V B NascimentoE W Plummer
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May 29, 2008·Journal of the American Chemical Society·Christophe TenailleauMatthew J Rosseinsky
Dec 7, 2017·ACS Applied Materials & Interfaces·Xinmao YinAndrivo Rusydi

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