التفاصيل البيبلوغرافية
| العنوان: |
Features of the Scaling of the Anomalous Hall Effect in (CoFeB)x(LiNbO3)100 −x Nanocomposite Films Below the Percolation Threshold: Manifestation of the Cotunneling Hall Conductance? |
| المؤلفون: |
Nikolaev, S. N., Chernoglazov, K. Yu., Bugaev, A. S., Granovsky, A. B., Rylkov, V. V. |
| المصدر: |
JETP Letters; Oct2023, Vol. 118 Issue 7, p508-513, 6p |
| مصطلحات موضوعية: |
ANOMALOUS Hall effect, PERCOLATION, SPIN-orbit interactions, NANOCOMPOSITE materials, QUANTUM tunneling composites |
| مستخلص: |
A scaling behavior of the anomalous Hall effect resistivity ρAHE versus the longitudinal resistivity ρ in (CoFeB)x(LiNbO3)100 −x nanocomposites with a low content of dispersed Co and Fe atoms (Nd ~ 4 × 1020 cm−3) in an amorphous LiNbO3 matrix is studied in the range x ≈ 40–48 at % below the percolation threshold xp ≈ 49 at %. A logarithmic temperature dependence of the conductivity σ ~ lnT has been observed in the range x ≈ 44–48 at %, which is transformed in the range x ≈ 40–42 at % to a square root law lnσ ∝ ‒(T0/T)1/2, which is characteristic of cotunneling transport processes in nanocomposites. It has been found that the exponent n ≈ 0.24 in the scaling law ρAHE/x ∝ [ρ(x)]n coincides within an accuracy of 5% with the exponent n in a similar dependence for nanocomposites based on the (CoFeB)x(Al2O3)100 −x matrix with a high content Nd ~1021–1022 cm–3 and with the exponent n in a parametric dependence ρAHE ∝ [ρ(T)]n for the samples with the minimum content x ≈ 40 at %. The found features are attributed to the correlated change in the probability of cotunneling transitions in a set of more than three centers under the effect of spin–orbit coupling. The manifestation of the barrier tunneling anomalous Hall effect at granule interfaces is also p-ossible. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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