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Alternating current magnetotransport in Sm0.1
5. R. Schmidt, J. Ventura, E. Langenberg, N. M. Nemes, C. Munuera, M. Varela, M. García-Hernández, C. Léon, and J. Santamaría, Phys. Rev. B 86, 035113 (2012).
18. X. Z. Yu, M. Uchida, Y. Onose, J. P. He, Y. Kaneko, T. Asaka, K. Kimoto, Y. Matsui, T. Arima, and Y. Tokura, J. Magn. Magn. Mater. 302, 391 (2002).
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We report frequency dependent (f = 0.1 to 5 MHz) electrical resistivity in Sm0.1La0.6Sr0.3MnO3 in superimposed dc magnetic fields (H = 0–1 kOe). Resistive (ρ′) and reactive (ρ″) components of the complex resistivity (ρ = ρ′+iρ″) were measured simultaneously. With increasing f, both ρ′ and ρ′′ increase abruptly at the onset of ferromagnetic transition (T c = 348 K) and exhibit an anomaly at T * ≈ 147 K ≪ T c in H = 0 kOe. The observed features in ρ′ and ρ′′ are depressed with increasing H leading to 35% magnetoresistance for ΔH = 300 Oe and f = 3 MHz. It is suggested that the frequency dependent magnetotransport is dominated by the field and frequency dependences of the ac permeability.
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