| Metal-to-Insulator Transitions in La2/3Sr1/3MnO3/LaMnO3 (LSMO/LMO) Superlattices |
| Sang-Woo Ryu, Hyun-M. Jang |
| Department of Materials Science and Engineering, and Pohang Accelerator Laboratory (PAL), Pohan University of Science and Technology (POSTECH) |
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| ABSTRACT |
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A series of manganite-based superlattices composed of half-metallic $La_{2/3}Sr_{1/3}MnO_3/LaMnO_3$ and insulating LaMnO$_3$ stacking layers were fabricated by employing pulsed laser deposition method. The dc resistivity increased drastically by simply reducing the stacking periodicity. The resistivity enhancement was accompanied by a gradual decrease in the temperature (T$_c$) of the Metal-to-Insulator Transition (MIT). This observation was interpreted as a small decrease in the effective metallic fraction near the percolation threshold. For the stacking periodicity less than a certain critical value, there appeared another transition to an insulating state at temperatures far below T$_c$. This low-temperature transition seems to be closely related to the AF-type (C-type) orbital ordering in newly formed insulating domains. |
| Key words:
Superlattice, Pulsed laser deposition, Metal-to-insulator transition, Stacking, Percolation |
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