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

Ronnow, HM; Renner, C; Aeppli, G; Kimura, T; Tokura, Y; (2006) Polarons and confinement of electronic motion to two dimensions in a layered manganite. NATURE , 440 (7087) 1025 - 1028. 10.1038/nature04650. Green open access

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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(1) 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(2) and polarized infrared spectroscopy(3). Here, using the same experimental tools, we show that there is a second family of transition-metal oxides-the layered manganites La2-2xSr1+2xMn2O7-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 through vacuum-tunnelling into a conventional metallic tip, as it is for them to move between Mn-rich layers within the material itself.

Type: Article
Title: Polarons and confinement of electronic motion to two dimensions in a layered manganite
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/nature04650
Keywords: GIANT MAGNETORESISTANCE, QUASI-PARTICLE, CHARGE, SURFACE, BI2SR2CACU2O8+DELTA, INTERFERENCE, TRANSITION, PEROVSKITE, PSEUDOGAP, OXIDES
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/9940
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