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Low-temperature resistance minimum in granular hole-doped cobaltites
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Image of FIG. 1.
FIG. 1.

X-ray diffraction pattern of the La0.8Ag0.2CoO3 cobaltite.

Image of FIG. 2.
FIG. 2.

Resistance values of hole-doped LSACO cobaltites, normalized to the resistance at 300 K as a function of temperature at different doping levels. R 300K, Ω: 2.42 (1); 0.0077 (2); 0.0026 (3); 0.00123 (4).

Image of FIG. 3.
FIG. 3.

Minimum in the temperature dependence of the normalized resistance of hole-doped cobaltites LSCO and LSACO at the level of substitution of lanthanum with strontium x ≈ 0.35 for B = 0 and B = 0.5 T. R 4.2K, Ω: LSCO – 4.7·10−4; LSACO – 0.0014. Symbols – experiment; solid lines – fitting curves calculated by the formula (1), see text. Dotted curve – the connecting line. On the inset – temperature dependence of resistance of LSACO in B = 0 and B = 0.5 T.

Image of FIG. 4.
FIG. 4.

Normalized resistance with a minimum (dots) and fit, calculated by the formula (1) (solid line 1) for the sample LSACO (x = 0.35, y = 0.05). Shown separately are the intrinsic granular contribution (curve 3) and the intergranular contribution (curve 2). Curve 4 is the spin-correlation function for the AFM interaction of granules.

Image of FIG. 5.
FIG. 5.

The temperature dependence of resistivity of samples with similar geometrical dimensions of the cobaltites LSCO (x = 0.35, y = 0.05) and LSACO (x = 0.35, y = 0.05) in B = 0 (curves 1 and 3) and applied magnetic field of 10 T (curves 2 and 4).

Image of FIG. 6.
FIG. 6.

Temperature dependence of magnetoresistance of cobaltites LSCO (x = 0.35, y = 0) and LSACO (x = 0.35, y = 0.05) in a magnetic field of 10 T.


Generic image for table
Table I.

Basic theoretical fit-parameters, obtained from the analysis of experimental data.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Low-temperature resistance minimum in granular hole-doped cobaltites