期刊
PHYSICAL REVIEW B
卷 79, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.045125
关键词
hopping conduction; lanthanum compounds; localised states; metal-insulator transition; strontium compounds; superlattices
The temperature dependence of the transport properties of (SrMnO3)(n)/(LaMnO3)(2n) superlattices has been systematically investigated by changing the number of interfaces while keeping the total thickness of the system fixed. The superlattices undergo a rich variety of transitions among metal, Mott variable range hopping insulator, interaction-induced Efros-Shklovskii insulator, and polaronic insulator. Interfaces play a fundamental role in tuning the metal-insulator transitions controlling the effective doping of the different layers. In the case of a bilayer, as clarified by a theoretical model, the single interface can extend its effects well far from it in the bulk layer.
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