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Transport properties of Co2CrAl Heusler alloy films

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Abstract

The effect of atomic disorder on the electron transport and the magnetoresistance (MR) of Co2CrAl Heusler alloy (HA) films has been investigated. We show that Co2CrAl films with L21 order exhibit a negative value for the temperature coefficient of resistivity (TCR) in a temperature range of 10 < T < 290 K, and the temperature dependence of electric conductivity varies as T 3/2 similarly to that of the zero-gap semiconductors. The atomic or the site disorder on the way of L21 → B2 → A2 → amorphous state in Co2CrAl HA films causes the deviation from this dependence: reduction in the absolute value of TCR as well as decrease in the resistivity down to ϱ(T = 293 K) ∼ 200 μΩ cm in comparison to ϱ(T = 293 K) ∼ 230 μΩ cm typical for the Co2CrAl films with L21 order. The magnetic-field dependence of MR of the Co2CrAl films with L21 order is determined by two competing contributions: a positive Lorentz scattering and a negative s-d scattering. The atomic disorder in Co2CrAl films drastically changes MR behavior due to its strong influence on the magnetic properties.

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Authors and Affiliations

  1. Institute of Metal Physics, National Academy of Sciences of Ukraine, 252680, 142 Kiev, Ukraine

    Y. V. Kudryavtsev

  2. q-Psi and Department of Physics, Hanyang University, 133-791, Seoul, Korea

    Y. P. Lee, Y. J. Yoo, M. S. Seo, J. M. Kim & J. S. Hwang

  3. Institute of Molecular Physics, Polish Academy of Sciences, 60-179, Poznań, Poland

    J. Dubowik

  4. Sunmoon University, 336-708, Asan, Korea

    K. W. Kim

  5. Kwangwoon University, 139-701, Seoul, Korea

    E. H. Choi

  6. Helmholtz Centre Berlin for Materials and Energy Gmbh, Glienicker Str. 100, 14109, Berlin, Germany

    O. Prokhnenko

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  1. Y. V. Kudryavtsev
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  2. Y. P. Lee
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  3. Y. J. Yoo
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  4. M. S. Seo
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  7. J. Dubowik
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Correspondence to Y. P. Lee.

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Kudryavtsev, Y.V., Lee, Y.P., Yoo, Y.J. et al. Transport properties of Co2CrAl Heusler alloy films. Eur. Phys. J. B 85, 19 (2012). https://doi.org/10.1140/epjb/e2011-20381-9

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