This article is cited in 2 papers

Surfaces, Electron and Ion Emission

Effect of lateral tensile stresses on the low-temperature electrical resistivity and magnetoresistance of La$_{0.67}$Ca$_{0.33}$MnO$_3$ nanofilms

Yu. A. Boikov, V. A. Danilov

Ioffe Institute, St. Petersburg

Abstract: The thickness of the buffer layer of strontium titanate introduced between an La$_{0.67}$Ca$_{0.33}$MnO$_3$ manganite film and a (001)La$_{0.29}$Sr$_{0.71}$Al$_{0.65}$Ta$_{0.35}$O$_3$ substrate is varied ($d_1$ = 7–70 nm) to influence effective misfit m in their lattice parameters. As $m$ increases, electrical resistivity $\rho$ of the film increases sharply and the maximum in the $\rho(T)$ dependence shifts toward low temperatures. At $T<$ 150 K, the temperature dependence of $\rho$ of the manganite film obeys the relationship $\rho=\rho_1+\rho_2T^{4.5}$, where parameter $\rho_1$ is independent of the temperature and magnetic field. Coefficient $\rho_2$ decreases with increasing magnetic field and increases with the misfit between the lattice parameters of the film and substrate, i.e., when the effective hole concentration in the manganite layer decreases.

Received: 27.05.2009

 English version: Technical Physics, 2010, 55:8, 1183–1188

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