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Optical properties of (SrMnO3)n/(LaMnO3)2n superlattices: an insulator-to-metal transition observed in the absence of disorder.
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We measure the optical conductivity of (SrMnO3)n/(LaMnO3)2n superlattices (SL) for n=1, 3, 5, and 8 and 10<T<400 K. Data show a T-dependent insulator to metal transition (IMT) for n≤3, driven by the softening of a polaronic mid-infrared band. At n=5 that softening is incomplete, while at the largest period n=8 compound the MIR band is independent of T and the SL remains insulating. One can thus first observe the IMT in a manganite system in the absence of the disorder due to chemical doping. Unsuccessful reconstruction of the SL optical properties from those of the original bulk |
materials suggest that (SrMnO3)n/(LaMnO3)2n heterostructures give rise to a novel electronic state.Retrieve articleOptical properties of (SrMnO3)n/(LaMnO3)2n superlattices: an insulator-to-metal transition observed in the absence of disorder.A. Perucchi, L. Baldassarre, A. Nucara, P. Calvani, C. Adamo, D.G. Schlom, P. Orgiani, L. Maritato, and S. Lupi |
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Ultima modifica il Mercoledì, 01 Ottobre 2014 10:19
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