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Negative Magnetoresistance in Amorphous Indium Oxide Wires

View Article: PubMed Central - PubMed

ABSTRACT

We study magneto-transport properties of several amorphous Indium oxide nanowires of different widths. The wires show superconducting transition at zero magnetic field, but, there exist a finite resistance at the lowest temperature. The R(T) broadening was explained by available phase slip models. At low field, and far below the superconducting critical temperature, the wires with diameter equal to or less than 100 nm, show negative magnetoresistance (nMR). The magnitude of nMR and the crossover field are found to be dependent on both temperature and the cross-sectional area. We find that this intriguing behavior originates from the interplay between two field dependent contributions.

No MeSH data available.


The T variation of R (in semi-log scale) at  B = 0 for 1 μm long wires with different [24(blue), 48(green) and 100(red) nm] widths.The wires show superconducting transition at TC around 1.8 K. Below TC, at lowest T, R saturate at finite values. (Inset:) R-T for the simultaneously prepared film, measured at B = 0 shows a sharp drop at TC = 1.76 K and R appeared to go to zero.
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f1: The T variation of R (in semi-log scale) at  B = 0 for 1 μm long wires with different [24(blue), 48(green) and 100(red) nm] widths.The wires show superconducting transition at TC around 1.8 K. Below TC, at lowest T, R saturate at finite values. (Inset:) R-T for the simultaneously prepared film, measured at B = 0 shows a sharp drop at TC = 1.76 K and R appeared to go to zero.

Mentions: We begin to present our findings by showing the variation of R with T, measured at B = 0. The respective R(T) plots, for 1 μm long wires with 3 different w, 24, 48, 100 nm, are shown in Fig. 1. The co-fabricated reference film has also been measured and the zero field R(T) for it is shown in the inset of Fig. 1 for comparison. It is seen that all the wires exhibited exponential (linear in semi-log scale) drop, signifying superconducting transition at B = 0. Nonetheless, they saturated at non-zero values and a residual R persist at low- T. The approach of 1D regime is herald by the higher value of the transition width (Δ(T)) in wires (ΔTwire ≈ 2 K) than that of the film (ΔTFilm ≈ 1.10 K)2034.


Negative Magnetoresistance in Amorphous Indium Oxide Wires
The T variation of R (in semi-log scale) at  B = 0 for 1 μm long wires with different [24(blue), 48(green) and 100(red) nm] widths.The wires show superconducting transition at TC around 1.8 K. Below TC, at lowest T, R saturate at finite values. (Inset:) R-T for the simultaneously prepared film, measured at B = 0 shows a sharp drop at TC = 1.76 K and R appeared to go to zero.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5120288&req=5

f1: The T variation of R (in semi-log scale) at  B = 0 for 1 μm long wires with different [24(blue), 48(green) and 100(red) nm] widths.The wires show superconducting transition at TC around 1.8 K. Below TC, at lowest T, R saturate at finite values. (Inset:) R-T for the simultaneously prepared film, measured at B = 0 shows a sharp drop at TC = 1.76 K and R appeared to go to zero.
Mentions: We begin to present our findings by showing the variation of R with T, measured at B = 0. The respective R(T) plots, for 1 μm long wires with 3 different w, 24, 48, 100 nm, are shown in Fig. 1. The co-fabricated reference film has also been measured and the zero field R(T) for it is shown in the inset of Fig. 1 for comparison. It is seen that all the wires exhibited exponential (linear in semi-log scale) drop, signifying superconducting transition at B = 0. Nonetheless, they saturated at non-zero values and a residual R persist at low- T. The approach of 1D regime is herald by the higher value of the transition width (Δ(T)) in wires (ΔTwire ≈ 2 K) than that of the film (ΔTFilm ≈ 1.10 K)2034.

View Article: PubMed Central - PubMed

ABSTRACT

We study magneto-transport properties of several amorphous Indium oxide nanowires of different widths. The wires show superconducting transition at zero magnetic field, but, there exist a finite resistance at the lowest temperature. The R(T) broadening was explained by available phase slip models. At low field, and far below the superconducting critical temperature, the wires with diameter equal to or less than 100 nm, show negative magnetoresistance (nMR). The magnitude of nMR and the crossover field are found to be dependent on both temperature and the cross-sectional area. We find that this intriguing behavior originates from the interplay between two field dependent contributions.

No MeSH data available.