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Anomalous positive magnetoresistance at low temperatures in nanocrystalline
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View: Figures


Image of FIG. 1.
FIG. 1.

“Zero-field” resistivity as a function of temperature for the nanocrystalline and polycrystalline samples of . Insets (a) and (b) highlight the and power law variations in the temperature intervals and in and , respectively. Insert (a) also displays a sudden drop in the resistivity of at .

Image of FIG. 2.
FIG. 2.

Longitudinal magetoresistance vs magnetic field isotherms at a few selected temperatures for and . The inset shows the enlarged view of some of these isotherms at low fields.

Image of FIG. 3.
FIG. 3.

Temperature variations of at a few selected fields for and . The insets (a) and (b) present an enlarged view of at a few fixed fields in within the temperature intervals of and , respectively.

Image of FIG. 4.
FIG. 4.

Temperature variations of “zero-field” and “in-field” resistivities for in the temperature range from at a few fixed field values in the low-field region. Inset shows that the upper critical field, , varies linearly with temperature, as is normally observed in a type II superconductor.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Anomalous positive magnetoresistance at low temperatures in nanocrystalline Ni3Al