Saturation of resistivity and Kohler's rule in Ni-doped La1.85Sr0.15CuO4 cuprate
A. Malinowski, V. L. Bezusyy, P. Nowicki
DOI 10.1103/PhysRevB.95.014521 · Physical Review B
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Abstract
We present the results of electrical transport measurements of La1.85Sr0.15Cu1−yNiyO4 thin single-crystal films at magnetic fields up to 9 T. Adding Ni impurity with strong Coulomb scattering potential to a slightly underdoped cuprate makes the signs of resistivity saturation at ρsat visible in the measurement temperature window up to 350 K. Employing the parallel-resistor formalism reveals that ρsat is consistent with the classical Ioffe-Regel-Mott limit and changes with carrier concentration n as ρsat∝1/n. Thermopower measurements show that Ni tends to localize mobile carriers, decreasing their effective concentration as n≅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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15Cu1-yNiyO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34.6 | Pressure not reported | midpoint |
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