Saturation of resistivity and Kohler's rule in Ni-doped La${}_{1.85}$Sr${}_{0.15}$CuO${}_4$ cuprate

Abstract

We present the results of electrical transport measurements of La${}_{1.85}$Sr${}_{0.15}$Cu${}_{1-y}$Ni${}_y$O${}_4$ thin single-crystal films at magnetic fields up to 9 T. Adding Ni impurity with strong Coulomb scattering potential to slightly underdoped cuprate makes the signs of resistivity saturation at ${\rho }_{sat}$ visible in the measurement temperature window up to 350 K. Employing the parallel-resistor formalism reveals that ${\rho }_{sat}$ is consistent with classical Ioffe-Regel-Mott limit and changes with carrier concentration $n$ as ${\rho }_{sat}\propto 1/\sqrt{n}$. Thermopower measurements show that Ni tends to localize mobile carriers, decreasing their effective concentration as $n\cong 0.15-y$. The classical unmodified Kohler's rule is fulfilled for magnetoresistance in the nonsuperconducting part of the phase diagram when applied to the ideal branch in the parallel-resistor model.

arXiv comment6 pages, 4 figures

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