Tuning of the metal-insulator transition in La0.75Sr0.25MnO3/PrBa2Cu3O7-δ superlattices

Haberkorn, N.; Guimpel, J.
July 2005
Applied Physics Letters;7/25/2005, Vol. 87 Issue 4, p042509
Academic Journal
We have investigated the magnetotransport and magnetic properties of La0.75Sr0.25MnO3/PrBa2Cu3O7-δ superlattices. Magnetic hysteresis loops show the expected ferromagnetic behavior, although the saturation magnetization is smaller than the expected value based on nominal layer thickness. We find that the electric transport on the superlattices can be qualitatively described using a simple layers-in-parallel model. We also find that the temperature at which the peak of the resistivity curve is located, and in consequence the temperature at which the maximum of the magnetoresistance curve are observed, are a function of layer thickness. The superlattices show an appreciable magnetoresistance for low temperatures, which may be consequence of a spin canted or weak antiferromagnetic manganite phase stabilized at the interfaces.


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