Electrical resistivity and optical properties of Co2−xMn1+xAl (x = 0, 0.25, 0.5, 0.75, 1) Heusler alloys

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Abstract

In the temperature range from 78 to 293 K, the temperature dependences of the electrical resistivity of Co2−xMn1+xAl (x = 0, 0.25, 0.5, 0.75, 1) Heusler alloys as well as their optical properties in the range of (0.155–5) eV at room temperature. It is shown that the electrical resistivity of all alloys exceeds 250 µOhm×cm and grows with increasing manganese content to values exceeding 380 µOhm×cm, and the type of temperature dependence of electrical resistivity changes from “metallic” for Co2MnAl to “semiconductor-like” for Mn2CoAl with transition through the invar Co1.75Mn1.25Al. It is demonstrated that interband transitions play a crucial role in the formation of the optical properties of the studied alloys. It is found that at room temperature, the electrical conductivity and optical conductivity at 0.38 eV decrease with increasing manganese concentration at x = 0.5 and 0.75, respectively, and then change slightly with increasing x. It is suggested that this behavior is related to changes in the band spectrum of alloys, which are most strongly manifested in the Mn2CoAl alloy.

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A. A. Semiannikova

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Author for correspondence.
Email: semiannikova@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

E. I. Shreder

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: semiannikova@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

A. A. Markin

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: semiannikova@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

Yu. A. Perevozchikova

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: semiannikova@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

P. B. Terentev

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: semiannikova@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

E. B. Marchenkova

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: semiannikova@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

V. V. Marchenkov

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: march@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

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Supplementary files

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2. Fig. 1. Temperature dependences of electrical resistance of Co2-xMn1+xAl alloys (x = 0, 0.25, 0.5, 0.75, 1).

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3. Fig. 2. Dispersion of the real ε1 and imaginary ε2 parts of the permittivity of Co2-хMn1+хAl alloys (x = 0, 0.25, 0.5, 0.75, 1).

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4. Fig. 3. Dispersion of optical conductivity σ(ω) of Co2-хMn1+хAl alloys (x = 0, 0.25, 0.5, 0.75, 1).

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5. Fig. 4. Dependences (a) of electrical conductivity σst = 1/ρ and (b) optical conductivity σ on concentration x for Heusler alloys Co2−xMn1+xAl (x = 0, 0.25, 0.5, 0.75, 1) at room temperature.

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